Details for Patent: 6,017,922
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Summary for Patent: 6,017,922
Title: | Thermally stable trimetrexates and processes for producing the same |
Abstract: | The present invention provides for thermally stable forms of 2,4-diamino-5-methyl-6-[(3,4,5-trimethoxyanilino)methyl] quinazoline, or trimetrexate. A crystalline 2,4-diamino-5-methyl-6-[(3,4,5-trimethoxyanilino)methyl] quinazoline monohydrate, or trimetrexate monohydrate, belonging to the space group P1(#2) and having a triclinic cell with dimensions of about a=7.699 .ANG., b=9.606 .ANG. and c=13.012 .ANG. is disclosed. A novel Schiff base compound, 2,4-diamino-5-methyl-6-[(3,4,5-trimethoxyphenylimino)-methinyl]quinazoline , is also disclosed. The present invention further provides novel methods of producing stable trimetrexate free base compounds, including crystalline trimetrexate monohydrate. The crystalline monohydrate form provides increased stability over the anhydrous form. |
Inventor(s): | Stogniew; Martin (Blue Bell, PA), Grafe; Ingomar (Nurnberg, DE), Morsdorf; Johann (Langenzenn, DE) |
Assignee: | U.S. Bioscience, Inc. (Conshohocken, PA) |
Application Number: | 09/080,290 |
Patent Claim Types: see list of patent claims | Compound; Composition; |
Drugs Protected by US Patent 6,017,922
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International Family Members for US Patent 6,017,922
Country | Patent Number | Estimated Expiration | Supplementary Protection Certificate | SPC Country | SPC Expiration |
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Australia | 4081799 | See Plans and Pricing | |||
Brazil | 9910543 | See Plans and Pricing | |||
Canada | 2333274 | See Plans and Pricing | |||
European Patent Office | 1080079 | See Plans and Pricing | |||
Japan | 2002515493 | See Plans and Pricing | |||
>Country | >Patent Number | >Estimated Expiration | >Supplementary Protection Certificate | >SPC Country | >SPC Expiration |