You’re using a public version of DrugPatentWatch with 5 free searches available | Register to unlock more free searches. CREATE FREE ACCOUNT

Last Updated: March 29, 2024

Claims for Patent: 4,933,456


✉ Email this page to a colleague

« Back to Dashboard


Summary for Patent: 4,933,456
Title: Dipyridoxyl phosphate NMRI contrast agents
Abstract:N,N'-bis-(pyridoxal-5-phosphate)-alkylenediamine-N,N'-diacetic acids, N,N'-bis-(pyridoxal-5-phosphate)-1,2-cycloalkylenediamine-N,N'-diacetic acids, and N,N'-bis-(pyridoxal-5-phosphate)-1,2-arylenediamine-N,N'-diacetic acids, the corresponding monophosphate compounds and monoacetic acid compounds, and their salts and esters form stable, highly soluble chelates with paramagnetic metal ions, and are highly effective NMRI contrast agents. Preferred contrast agents are paramagnetic ion chelates of N,N'-bis-(pyridoxal-5-phosphate)ethylene-diamine-N,N'-diacetic acid, N,N'-bis-(pyridoxal-5-phosphate)trans-1,2-cyclohexylenediamine-N,N'-diacet ic acid, N,N'-bis-(pyridoxal-5-phosphate)trans-1,2-arylenediamine-N,N'-diacetic acid, and the soluble calcium salts thereof. Novel intermediates for forming these compounds are N,N'-bis(pyridoxal-5-phosphate)alkylenediimines, N,N'-bis(pyridoxal-5-phosphate)alkylenediamines, N,N'-bis(pyridoxal-5-phosphate)-1,2-cycloalkylenediimines, N,N'-bis(pyridoxal-5-phosphate)-1,2-cycloalkylenediamines, N,N'-bis(pyridoxal-5-phosphate(-1,2-arylenediamines, and the corresponding monophosphate compounds.
Inventor(s): Rocklage; Scott M. (Saratoga, CA), Quay; Steven C. (Los Altos Hills, CA)
Assignee: Salutar, Inc. (Sunnyvale, CA)
Application Number:07/047,614
Patent Claims: 1. A metal ion chelate of a chelating compound of the formula: ##STR9## wherein: R is hydrogen or ##STR10## R.sub.1 is hydrogen or ##STR11## with the proviso that at least one of R and R.sub.1 is other than hydrogen;

R.sub.5 and R.sub.6 are each, independently, hydroxy, alkoxy having from 1 to 18 carbons, hydroxy-substituted alkoxy having from 1 to 18 carbons, amino, or alkylamido having from 1 to 10 carbons;

R.sub.3 is alkylene having from 1 to 8 carbons, 1,2-cycloalkylene having from 5 to 8 carbons, or 1,2-arylene having from 6 to 10 carbons;

R.sub.4 is hydrogen, hydroxymethyl, alkyl having from 1 to 6 carbons, or ##STR12## each R.sub.7 is, independently, hydrogen, hydroxy-substituted alkyl having from 1 to 18 carbons, or aminoalkyl having from 1 to 18 carbons; and

the chelated metal ion is a paramagnetic ion of a metal having an atomic number of from 21 to 29, inclusive, 42, 44, or from 58 to 70, inclusive,

or a physiologically biocompatible inorganic or organic salt of said metal ion chelate.

2. A metal ion chelate according to claim 1 wherein R and R.sub.1 are each other than hydrogen, or a salt of said metal ion chelate.

3. A metal ion chelate according to claim 1 wherein each R.sub.7 is hydrogen, or a salt of said metal ion chelate.

4. A metal ion chelate according to claim 1 wherein R and R.sub.1 are each other than hydrogen, R.sub.5 and R.sub.6 are each, independently, hydroxy, alkoxy having from 1 to 8 carbons, hydroxyethyl, dihydroxypropyl, amino, or alkylamido having from 1 to 8 carbons, or a salt of said metal ion chelate.

5. A metal ion chelate according to claim 4 wherein R.sub.3 is alkylene having from 2 to 6 carbons, or a salt of said metal ion chelate.

6. A metal ion chelate of N,N'-bis(pyridoxal-5-phosphate)ethylenediamine-N,N'-diacetic acid or a salt thereof, wherein the metal ion is as recited in claim 1, or a salt of said metal ion chelate.

7. A metal ion chelate according to claim 4 wherein R.sub.3 is cyclohexyl, or a salt of said metal ion chelate.

8. A metal ion chelate of N,N'-bis(pyridoxal-5-phosphate)-trans-1,2-cyclohexyldiamine-N,N'-diacetic acid or a salt thereof, wherein the metal ion is as recited in claim 1, or a salt of said metal ion chelate.

9. A metal ion chelate according to claim 1 wherein the metal ion is divalent or trivalent, or a salt of said metal ion chelate.

10. A metal ion chelate according to claim 1 wherein the metal ion is chromium (III), manganese (II), iron (III), iron (II), cobalt (II), nickel (II), copper (II), praseodymium (III), neodymium (III), samarium (III), ytterbium (III), gadolinium (III), terbium (III), dysprosium (III), holmium (III), or erbium (III), or a salt of said metal ion chelate.

11. A metal ion chelate according to claim 1 wherein the metal ion is manganese (II), or a salt of said metal ion chelate.

12. A manganese (II) chelate of N,N'-bis(pyridoxal-5-phosphate)ethylenediamine-N,N'-diacetic acid or a salt thereof, or a salt of said manganese (II) chelate.

13. A manganese (II) chelate of N,N'-bis(pyridoxal-5-phosphate)-trans-1,2-cyclohexyldiamine-N,N'-diacetic acid or a salt thereof, or a salt of said manganese (II) chelate.

14. A metal ion chelate according to claim 1 in the form of a calcium salt of an anionic chelate complex of a paramagnetic metal ion and a chelating compound of formula I, or a salt of said metal ion chelate.

15. A metal ion chelate or salt according to claim 14 wherein the molar ratio of calcium to chelating compound is from 0.05 to 1.0.

16. A metal ion chelate in the form of a calcium salt of the manganese (II) chelate of claim 12 or a salt thereof.

17. A metal ion chelate or salt according to claim 16 wherein the molar ratio of calcium to chelating compound is from 0.05 to 1.0.

18. A sodium-calcium salt of a manganese (II) chelate of N,N'-bis(pyridoxal-5-phosphate)ethylenediamine-N,N'-diacetic acid or a salt thereof.

Make Better Decisions: Try a trial or see plans & pricing

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.