Substituted camptothecin derivatives and process for their preparation
US5856333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1997 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Jan 27, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P35/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to substituted camptothecin derivatives of formula (I) wherein the symbol - - - - represents a single or double bond; R.sub.1, R.sub.2 and R.sub.3 are as defined under (a) or (b) below: (a) R.sub.1 and R.sub.2 are, each independently, hydrogen; C.sub.1 -C.sub.4 alkyl; C.sub.3 -C.sub.7 cycloalkyl; phenyl C.sub.1 -C.sub.6 alkyl; an optionally substituted phenyl ring; --NR.sub.5 R.sub.6 wherein one of R.sub.5 and R.sub.6 is hydrogen, C.sub.1 -C.sub.6 alkyl or benzyl and the other is hydrogen, C.sub.1 -C.sub.6 alkanoyl, an optionally substituted C.sub.1 -C.sub.6 alkoxycarbonyl, an optionally substituted benzoyl, phenyl C.sub.1 -C.sub.6 alkanoyl, an optionally substituted C.sub.1 -C.sub.6 alkoxycarbonyl, an optionally substituted phenoxycarbonyl or phenyl C.sub.1 -C.sub.6 alkoxycarbonyl, or R.sub.5 and R.sub.6, combined together with the nitrogen atom to which they are linked, form a 4-7 membered saturated, optionally substituted, heteromonocyclic ring residue; COOR.sub.8 wherein R.sub.8 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.7 cycloalkyl or phenyl C.sub.1 -C.sub.6 alkyl; or COR.sub.9 wherein Rg is C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.7 cyclo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.