Method of making asymmetric de ring intermediates for the synthesis of camptothecin and camptothecin analogs
US5395939A · kind A · utility
3Cited by
8References
7Claims
0Family size
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Key dates
| Filing date | Nov 30, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Nov 30, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D491/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Methods of making asymmetric DE ring intermediates for the synthesis of camptothecin and camptothecin analogs employ a dioxane intermediate as the immediate precursor to the DE ring intermediate. Novel intermediates are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.