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Last Updated: April 23, 2024

Claims for Patent: 7,202,361


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Summary for Patent: 7,202,361
Title:Antitumoral ecteinascidin derivatives
Abstract: This invention relates to compounds of the formula: ##STR00001## wherein: the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of H, C(.dbd.O)R\', C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, or aryl; each of the R\' groups is independently selected from the group consisting of H; OH; NO.sub.2; NH.sub.2; SH; CN; halogen; .dbd.O; C(.dbd.O)H; C(.dbd.O)CH.sub.3; CO.sub.2H; or C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, or aryl, each of which, independently, may be substituted with one or more substituents selected from the group consisting of halogen, cyano, hydroxy, nitro, azido; alkanoyl, carboxamido, alkyl, alkenyl, alkynyl, aryloxy, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, aminoalkyl, carbocylic aryl having 6 or more carbons, and aralkyl; X.sub.2 is OX.sub.1 or N(X.sub.1).sub.2 wherein each X.sub.1 is independently H, C(.dbd.O)R\' where R\' is as defined, C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, aryl, alkoxy, heterocyclyl, or two X.sub.1 groups together form a cyclic substituent on the nitrogen atom, or X.sub.1 is SO.sub.2CH.sub.3 when X.sub.2 is OX.sub.1, or N(X.sub.1).sub.2 is NHCOalkylCOOH, Nilbiotin, NH(aa).sub.y where aa is amino acid acyl andy is 1, 2 or 3 optionally with a amide terminal group, protected NHCOCH(NH.sub.2)CH.sub.2SH, NHCOalkenylaryl substituted with CF.sub.3, or m-methoxycarbonylbenzoylNH; wherein N(X.sub.1).sub.2 is not NH.sub.2; X.sub.3 is selected of OR.sub.1 where R.sub.1 is as defined, CN, (.dbd.O), or H; X.sub.4 is--H or C.sub.1 C.sub.18 alkyl; and X.sub.5 is selected of H, or R.sub.1 where R.sub.1 is as defined; provided that the compound is not ecteinascidin 583 or 597, which are useful for treating tumors.
Inventor(s): Flores; Maria (Seville, ES), Francesch; Andres (Madrid, ES), Gallego; Pilar (Madrid, ES), Chicharro; Jose Luis (Madrid, ES), Zarzuelo; Maria (Madrid, ES), Fernandez; Carolina (Madrid, ES), Manzanares; Ignacio (Madrid, ES)
Assignee: PharmaMar (Madrid, ES)
Application Number:10/240,963
Patent Claims:1. A compound of the formula: ##STR00174## wherein: the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of H, C(.dbd.O)R', C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, or aryl; each of the R' groups is independently selected from the group consisting of H; OH; NO.sub.2; NH.sub.2; SH; CN; halogen; .dbd.O; C(.dbd.O)H; C(.dbd.O)CH.sub.3; CO.sub.2H; or C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, or C.sub.2 C.sub.18 alkynyl, each of which, independently, may be substituted with one or more substituents selected from the group consisting of halogen, cyano, hydroxy, nitro, azido; alkanoyl, carboxamido, alkyl, alkenyl, alkynyl, aryloxy, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, carbocylic aryl having 6 or more carbons, and aralkyl; or unsubstituted aryl; X.sub.2 is OX.sub.1 or N(X.sub.1).sub.2 wherein each X.sub.1 is independently H, C(.dbd.O)R' where R' is as defined, unsubstituted C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, aryl, alkoxy, heterocyclyl, or two X.sub.1 groups together form a cyclic substituent on the nitrogen atom, or X.sub.1 is SO.sub.2CH.sub.3 when X.sub.2 is OX.sub.1, or N(X.sub.1).sub.2 is NHCOalkylCOOH, NHbiotin, NH(aa).sub.y where aa is amino acid acyl and y is 1, 2 or 3 optionally with a amide terminal group, protected NHCOCH(NH.sub.2)CH.sub.2SH, NHCOalkenylaryl substituted with CF.sub.3, or m-methoxycarbonylbenzoylNH; wherein N(X.sub.1).sub.2 is not NH.sub.2; X.sub.3 is selected of OR.sub.1 where R.sub.1 is as defined, CN, (.dbd.O), or H; X.sub.4 is --H or C.sub.1 C.sub.18 alkyl; and X.sub.5 is selected of H, or R.sub.1 where R.sub.1 is as defined; with the exception of compounds 14 and 47 of U.S. Pat. No. 5,721,362.

2. A compound according to claim 1, wherein R.sub.1 is C(.dbd.O)R', where R' is H, unsubstituted alkyl, or alkyl substituted with one or more substituents selected from the group consisting of halogen, cyano, hydroxy, nitro, azido; alkanoyl, carboxamido, alkyl, alkenyl, alkynyl, aryloxy, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, aminoalkyl, carbocylic aryl having 6 or more carbons, and aralkyl.

3. A compound according to claim 2, wherein R.sub.1 is acetyl.

4. A compound according to claim 1, wherein R.sub.2 is H or methyl.

5. A compound according to claim 4, wherein R.sub.2 is methyl.

6. A compound according to claim 1, wherein X.sub.3 is OH or CN.

7. A compound according to claim 1, wherein X.sub.4 is H or Me.

8. A compound according to claim 1, wherein X.sub.5 is H or C.sub.1 C.sub.18 alkyl.

9. A compound according to claim 8, wherein X.sub.5 is H.

10. A compound according to claim 1 of formula: ##STR00175## wherein the substituent groups R.sub.1, R.sub.2, X.sub.1, X.sub.3, X.sub.4 and X.sub.5 are as defined.

11. A compound according to claim 10, wherein one X.sub.1 is hydrogen.

12. A compound according to claim 10, wherein N(X.sub.1).sub.2 is --NHCOalkyl and may be halosubstituted on the alkyl group; --NHCOalkylCOOH; protected --NHCOCH(NH.sub.2)CH.sub.2SH where the NH.sub.2 is protected with an alloc group and the SH is protected with an Fm group; --NHbiotin; --NHaryl; --NH(aa)y where aa is an amino acid acyl and y is 1, 2 or 3 and wherein any NH.sub.2 is optionally protected with an alloc group; phthalimido formed from two X.sub.1 groups with the adjacent nitrogen; --NH(unsubstituted alkyl); --NHCOalkenylaryl, which is optionally substituted with 3-trifluoromethyl.

13. A compound according to claim 10, wherein N(X.sub.1).sub.2 is NHAc, NHCO(CH.sub.2).sub.2COOH, NHCOCH(NHAlloc)CH.sub.2SFm, NHCO(CH.sub.2).sub.14CH.sub.3, NHTFA, NHCO(CH.sub.2).sub.2CH.sub.3, NHCOCH.sub.2CH(CH.sub.3).sub.2, NHCO(CH.sub.2).sub.6CH.sub.3, NHBiotin, NHCOCinn, NHCO-(p-F.sub.3C)-Cinn, NHVal-NH.sub.2, NHVal-N--Ac, NHVal-N--COCinn, NHVal-Ala-NH.sub.2, NHVal-Ala-N--Ac, NHAla-NH.sub.2, NHCOCH(NH.sub.2)CH.sub.2SFm, NPhth, NH--(m-CO.sub.2Me)--Bz, NMe.sub.2, NHVal-Ala-N--COCinn, NHAla-N--Ac, or NHAla-N--COCinn.

14. A compound according to claim 1 of formula: ##STR00176## wherein the substituent groups R.sub.1, R.sub.2, X.sub.1, X.sub.3, X.sub.4 and X.sub.5 are as defined.

15. A compound according to claim 14, wherein X.sub.1 is H.

16. A compound according to claim 14, wherein OX.sub.1 is OH, OAc, OCOCF.sub.3, OCOCH.sub.2CH.sub.2CH.sub.3, OCO(CH.sub.2).sub.6CH.sub.3, OCO(CH.sub.2).sub.14CH.sub.3, OCOCH.dbd.CHPh, OSO.sub.2CH.sub.3.

17. A compound of formula (XVIIb): ##STR00177## where R.sub.1 and R.sup.4 together form a group of formula (VIa) or (VIb): ##STR00178## wherein the --NH.sub.2 group in formula (VIa) is derivatised to give derivative compounds in which the --CHNH.sub.2 group of formula VIa is replaced by a group --CHNHX.sub.1 or --CHN(X.sub.1).sub.2, in which NHX.sub.1 and N(X.sub.1).sub.2; are not NH.sub.2: wherein each X.sub.1 is independently: C(.dbd.O)R' where each of the R' groups is independently selected from the group consisting of H; OH; NO.sub.2; NH.sub.2; SH; CN; halogen; .dbd.O; C(.dbd.O)H; C(.dbd.O)CH.sub.3: CO.sub.2H; or C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, or C.sub.2 C.sub.18 alkynyl, each of which, independently, may be substituted with one or more substituents selected from the group consisting of halogen, cyano, hydroxy, nitro, azido; alkanoyl, carboxamido, alkyl, alkenyl, alkynyl, aryloxy, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, carbocylic aryl having 6 or more carbons, and aralkyl; or unsubstituted aryl; or unsubstituted C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, aryl, alkoxy, heterocyclyl, or two X.sub.1 groups together form a cyclic substituent on the nitrogen atom, or N(X.sub.1).sub.2 is NHCOalkylCOOH, NHbiotin, NH(aa).sub.y where aa is amino acid acyl and y is 1, 2 or 3 optionally with a amide terminal group, protected NHCOCH(NH.sub.2)CH.sub.2SH, NHCOalkenylaryl substituted with CF.sub.3, or m-methoxycarbonylbenzoylNH; R.sup.5 is --H; --OH; or O-acyl, wherein the acyl group is of formula --CO--R.sup.a, wherein R.sup.a is alkyl, alkoxy, alkylene, alkenyl, arylalkyl, aryl, arylalkylene, amino acid, aromatic heterocyclyl, or partially or completely saturated heterocycyl, each optionally substituted with halo, cyano, nitro, carboxyalkyl, alkoxy, aryl, aryloxy, heterocyclyl, heterocycyloxy, alkyl, amino or substituted amino; R.sup.7 is --OCH.sub.3 and R.sup.8 is --OH or R.sup.7 and R.sup.8 together form a group --O--CH.sub.2--O--; R.sup.14a R.sup.14b are both --H or one is --H and the other is --OH, --OCH.sub.3 or --OCH.sub.2CH.sub.3, or R.sup.14a and R.sup.14b together form a keto group; and R.sup.15 is --H or --OH; R.sup.21 is --H, --OH or --CN; and derivatives where the group --NCH.sub.3-- at the 12-position is replaced by --NH-- or --NCH.sub.2CH.sub.3--; and derivatives where the --OH group in the compound of formula (VIb) is derivatised to give derivative compounds where the --CHOH group of VIb is replaced by CHOX.sub.1 where X.sub.1 is: C(.dbd.O)R' where each of the R' groups is independently selected from the group consisting of H; OH; NO.sub.2; NH.sub.2; SH; CN; halogen; .dbd.O; C(.dbd.O)H; C(.dbd.O)CH.sub.3; CO.sub.2H; or C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2C.sub.18 alkynyl, or aryl, each of which, independently, may be substituted with one or more substituents selected from the group consisting of halogen, cyano, hydroxy, nitro, azido; alkanoyl, carboxamido, alkyl, alkenyl, alkynyl, aryloxy, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, aminoalkyl, carbocylic aryl having 6 or more carbons, and aralkyl; or C.sub.1 C.sub.18 alkyl, C.sub.2 C.sub.18 alkenyl, C.sub.2 C.sub.18 alkynyl, aryl, alkoxy, heterocyclyl, or X.sub.1 is SO.sub.2CH.sub.3 when X.sub.2 is OX.sub.1; with the exception of N-acetylecteinascidin 597.

18. A compound according to claim 17, wherein R.sup.5 is acyloxy of up to 4 carbon atoms.

19. A compound according to claim 18, wherein R.sup.5 is acetyloxy.

20. A compound according to claim 17, wherein R.sup.7 and R.sup.8 together form a group --O--CH.sub.2--O--.

21. A compound according to claim 17, wherein when R.sup.5 is O-acyl, the acyl group is alkanoyl, haloalkanoyl, arylalkanoyl, alkenoyl, heterocyclylacyl, or aroyl, arylaroyl, haloaroyl, or nitroaroyl.

22. A compound according to claim 17, where R.sup.a is alkyl, haloalkyl, alkoxyalkyl, haloalkoxyalkyl, arylalkylene, haloalkylarylakylene, arylalkyl, alkenyl or amino acid.

23. A compound according to claim 17, wherein R.sup.a--CO-- is acetyl, trifluoroacetyl, 2,2,2-trichloroethoxycarbonyl, isovalerylcarbonyl, trans-3-(trifluoromethyl)cinnamoylcarbonyl, heptafluorobutyrylcarbonyl, decanoylcarbonyl, trans-cinnamoylcarbonyl, butyrylcarbonyl, 3-chloropropyonylcarbonyl, cinnamoylcarbonyl, 4-methylcinnamoylcarbonyl, hydrocinnamoylcarbonyl, trans-hexenoylcarbonyl, alanyl, arginyl, aspartyl, asparagyl, cystyl, glutamyl, glutaminyl, glycyl, histidyl, hydroxyprolyl, isoleucyl, leucyl, lysyl, methionyl, phenylalanyl, prolyl, seryl, threonyl, thyronyl, tryptophyl, tyrosyl, valyl, phthalimido or other cyclic amide.

24. A compound according to claim 17, wherein --CO--R.sup.a is derived from an amino acid and includes an amino group which itself forms an acyl derivative.

25. A compound according to claim 24, wherein the N-acyl compound is a dipeptide which in turn can form N-acyl derivatives.

26. A compound according to claim 17 wherein when R.sup.5 is O-acyl, the acyl group is an aliphatic acyl group.

27. A compound according to claim 17 wherein R.sup.14a and R.sup.14b are hydrogen.

28. A compound according to claim 17, wherein R.sup.15 is hydrogen.

29. A compound according to claim 17 of the formula (XVIII); ##STR00179## wherein R.sup.1, R.sup.4 and R.sup.21 are as defined in claim 17.

30. A compound according to claim 1, which is in accordance with the following definitions: TABLE-US-00006 X.sub.2 X.sub.3 X.sub.4 R.sub.1 AcNH-- OH Me Ac F.sub.3CCONH-- OH Me Ac CH.sub.3(CH.sub.2).sub.2CONH-- OH Me Ac (CH.sub.3).sub.2CHCH.sub.2CONH-- OH Me Ac CH.sub.3(CH.sub.2).sub.6CONH-- OH Me Ac CH.sub.3(CH.sub.2).sub.14CONH-- OH Me Ac PhCONH-- OH Me Ac CinnCONH-- OH Me Ac p-F.sub.3C-CinnCONH-- OH Me Ac BiotinCONH-- OH Me Ac HO.sub.2CCH.sub.2CH.sub.2CONH-- OH Me Ac PrNH-- OH Me Ac NH.sub.2-ValNH-- OH Me Ac Ac--N-ValNH-- OH Me Ac CinnCO--N-ValNH-- OH Me Ac NH.sub.2-Ala-ValNH-- OH Me Ac Ac--N-Ala-ValNH-- OH Me Ac CinnCO--N-Ala-ValNH-- OH Me Ac NH.sub.2-AlaNH-- OH Me Ac CinnCO--N-AlaNH-- OH Me Ac FmSCH.sub.2CH(NHAlloc)CONH-- OH Me Ac HO-- OH Me Ac AcO-- OH Me Ac CH.sub.3(CH.sub.2).sub.2COO-- OH Me Ac CH.sub.3(CH.sub.2).sub.6COO-- OH Me Ac CH.sub.3(CH.sub.2).sub.14COO-- OH Me Ac CinnCOO-- OH Me Ac MeSO.sub.3-- OH Me Ac AcNH-- CN Me Ac AcNH-- CN Me H AcNH-- CN H Ac F.sub.3CCONH-- CN Me Ac CH.sub.3(CH.sub.2).sub.2CONH-- CN Me Ac (CH.sub.3).sub.2CHCH.sub.2CONH-- CN Me Ac CH.sub.3(CH.sub.2).sub.6CONH-- CN Me Ac CH.sub.3(CH.sub.2).sub.14CONH-- CN Me Ac PhCONH-- CN Me Ac CinnCONH-- CN Me Ac p-F.sub.3C-CinnCONH-- CN Me Ac PhtN-- CN Me Ac 2-MeO.sub.2C--C.sub.6H.sub.4--CONH-- CN Me Ac BiotinNH-- CN Me Ac HO.sub.2C(CH.sub.2).sub.2CONH-- CN Me Ac (CH.sub.3).sub.2N-- CN Me Ac PrNH-- CN Me Ac NH.sub.2-ValNH-- CN Me Ac Ac--N-ValNH-- CN Me Ac CinnCO--N-ValNH-- CN Me Ac NH.sub.2-Ala-ValNH-- CN Me Ac Ac--N-Ala-ValNH-- CN Me Ac CinnCO--N-Ala-ValNH-- CN Me Ac NH.sub.2-AlaNH-- CN Me Ac Ac--N-AlaNH-- CN Me Ac CinnCO--N-AlaNH-- CN Me Ac FmSCH.sub.2CH(NHAlloc)CONH-- CN Me Ac FmSCH.sub.2CH(NH.sub.2)CONH-- CN Me Ac Cl.sub.3CCH.sub.2OCONH-- CN Me Ac HO-- CN Me Ac AcO-- CN Me Ac F.sub.3CCOO-- CN Me Ac CH.sub.3(CH.sub.2).sub.2COO-- CN Me Ac CH.sub.3(CH.sub.2).sub.6COO-- CN Me Ac CH.sub.3(CH.sub.2).sub.14COO-- CN Me Ac CinnCOO-- CN Me Ac MeSO.sub.3-- CN Me Ac

X.sub.5 is H and R.sub.2 is Me.

31. A compound (4b) of formula: ##STR00180##

32. A compound (4h) of formula: ##STR00181##

33. A compound (4p) of formula: ##STR00182##

34. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of H, C(.dbd.O)R', or unsubstituted C.sub.1 C.sub.18 alkyl.

35. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of C(.dbd.O)R' or unsubstituted C.sub.1 C.sub.18 alkyl.

36. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of H, C(.dbd.O)R', unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, or unsubstituted aryl.

37. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of: H; C(.dbd.O)R'; or C.sub.1 C.sub.18 alkyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

38. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of: H; C(.dbd.O)R'; C.sub.2 C.sub.18 alkenyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic; or C.sub.2 C.sub.18 alkynyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

39. The compound of claim 1, wherein the substituent groups defined by R.sub.1, R.sub.2 are each independently selected of: H; C(.dbd.O)R'; or aryl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

40. The compound of claim 1, wherein each X.sub.1 is independently H or unsubstituted C.sub.1 C.sub.18 alkyl.

41. The compound of claim 1, wherein each X.sub.1 is independently H or unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, unsubstituted alkoxy, or unsubstituted heterocyclyl.

42. The compound of claim 1, wherein each X.sub.1 is independently H or C.sub.2 C.sub.18 alkenyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

43. The compound of claim 1, wherein each X.sub.1 is independently H or C.sub.2 C.sub.18 alkynyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

44. The compound of claim 1, wherein each X.sub.1 is independently H or aryl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR, SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

45. The compound of claim 1, wherein each X.sub.1 is independently H or alkoxy substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

46. The compound of claim 1, wherein each X.sub.1 is independently H or heterocyclyl substituted with one or more substituents selected from the group consisting of OH, OR', SH, SR', SOR', SO.sub.2R', NO.sub.2, NH.sub.2, NHR', N(R').sub.2, NHC(O)R', CN, halogen, .dbd.O, unsubstituted C.sub.1 C.sub.18 alkyl, unsubstituted C.sub.2 C.sub.18 alkenyl, unsubstituted C.sub.2 C.sub.18 alkynyl, unsubstituted aryl, and unsubstituted heteroaromatic.

47. A pharmaceutical composition comprising a compound according to claim 1, together with a pharmaceutically acceptable carrier or diluent.

48. The composition of claim 47 further comprising one or more other drugs selected from the group consisting of taxol, paclitaxel, taxotere, docetaxel, vincristine, vinblastine, 5-fluorouracil, cytarabine, gemcitabine, pentostatin, methotrexate, cyclophosphamide, ifosphamide, adriamycin, doxorubicin, pharmorubicin, epirubicin, etoposide, tamoxifen, flutamide, leuprorelin, goserelin, cyprotrone, octreotide, herceptin, cis-platin, carbonplatin, oxaliplatin, paraplatin, aplidine, or dexamethasone.

49. A method of treating a tumor resulting from lung cancer, colon cancer or melanoma, the method comprising administering to a mammal an effective amount of a compound of claim 1.

50. The method of claim 49, wherein the compound is a compound of claim 10.

51. The method of claim 49, wherein the compound is a compound of claim 14.

52. A method of treating a tumor resulting from lung cancer, colon cancer or melanoma, the method comprising administering to a mammal an effective amount of a compound of claim 17.

53. The method of claim 52, wherein the compound is a compound of claim 29.

54. The method of claim 49, wherein the compound is a compound of claim 30, 31, 32, or 33.

55. The method of claim 49, wherein the compound is administered in combination with another drug selected from the group consisting of taxol, paclitaxel, taxotere, docetaxel, vincristine, vinblastine, 5-fluorouracil, cytarabine, gemcitabine, pentostatin, methotrexate, cyclophosphamide, ifosphamide, adriamycin, doxorubicin, pharmorubicin, epirubicin, etoposide, tamoxifen, flutamide, leuprorelin, goserelin, cyprotrone, octreotide, herceptin, cis-platin, carbonplatin, oxaliplatin, paraplatin, aplidine, or dexamethasone.

56. A method of treating leukemia, lung cancer, colon cancer or melanoma, the method comprising administering to a mammal an effective amount of a compound of claim 1.

57. The method of claim 56, wherein the compound is a compound of claim 10.

58. The method of claim 56, wherein the compound is a compound of claim 14.

59. A method of treating leukemia, lung cancer, colon cancer or melanoma, the method comprising administering to a mammal an effective amount of a compound of claim 17.

60. The method of claim 59, wherein the compound is a compound of claim 29.

61. The method of claim 56, wherein the compound is a compound of claim 30, 31, 32, or 33.

62. The method of claim 56, wherein the compound is administered in combination with another drug selected from the group consisting of taxol, paclitaxel, taxotere, docetaxel, vincristine, vinblastine, 5-fluorouracil, cytarabine, gemcitabine, pentostatin, methotrexate, cyclophosphamide, ifosphamide, adriamycin, doxorubicin, pharmorubicin, epirubicin, etoposide, tamoxifen, flutamide, leuprorelin, goserelin, cyprotrone, octreotide, herceptin, cis-platin, carbonplatin, oxaliplatin, paraplatin, aplidine, or dexamethasone.

63. The method of claim 56, wherein the cancer is a leukemia.

64. The method of claim 56, wherein the cancer is lung cancer.

65. The method of claim 56, wherein the cancer is colon cancer.

66. The method of claim 56, wherein the cancer is a melanoma.

67. The method of claim 52, wherein the compound is administered in combination with another drug selected from the group consisting of taxol, paclitaxel, taxotere, docetaxel, vincristine, vinblastine, 5-fluorouracil, cytarabine, gemcitabine, pentostatin, methotrexate, cyclophosphamide, ifosphamide, adriamycin, doxorubicin, pharmorubicin, epirubicin, etoposide, tamoxifen, flutamide, leuprorelin, goserelin, cyprotrone, octreotide, herceptin, cis-platin, carbonplatin, oxaliplatin, paraplatin, aplidine, or dexamethasone.

68. The method of claim 59, wherein the compound is administered in combination with another drug selected from the group consisting of taxol, paclitaxel, taxotere, docetaxel, vincristine, vinblastine, 5-fluorouracil, cytarabine, gemcitabine, pentostatin, methotrexate, cyclophosphamide, ifosphamide, adriamycin, doxorubicin, pharmorubicin, epirubicin, etoposide, tamoxifen, flutamide, leuprorelin, goserelin, cyprotrone, octreotide, herceptin, cis-platin, carbonplatin, oxaliplatin, paraplatin, aplidine, or dexamethasone.

69. The method of claims 49, 52, 56, or 59, wherein the compound is administered in combination with another drug selected from the group consisting of taxane drugs, podophylotoxins, vinca alkaloids, purine analogues, nitrogen mustards, antracycline drugs, estrogens, antiestrogens, androgens, antibody derivatives, platinum drugs, nitrosoureas, matrix metalloproteinase inhibitors, or didemnins.

70. The method of claims 49, 52, 56, or 59, wherein the compound is administered in combination with another drug selected from the group consisting of microtubule modulators, antimetabolite drugs, alkylating agents, drugs which target DNA, drugs which target topoisomerases, hormones and hormone agonists or antagonists, drugs which target signal transduction in tumour cells, alkylating drugs, drugs potentially affecting metastasis of tumours, gene therapy and antisense agents, antibody therapeutics, bioactive compounds of marine origin, steroid analogues, anti-inflammatory drugs, or anti-emetic drugs.

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