Process for the preparation of polycyclic compounds
US5053510A · kind A · utility
2Cited by
0References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Apr 18, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P31/04
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of a compound of formula ##STR1## or a salt thereof, wherein R.sub.1 is hydrogen or trialkylacetyl, R.sub.2 is hydrogen or acetyl and R.sub.3 is alkyl, which process comprises cyclising a compound of formula ##STR2## wherein R.sub.1 is trialkylacetyl and, if desired, converting a compound of formula I obtainable by said process or in another manner, or a salt thereof, into another compound of formula I or a salt thereof, or converting a resultant free compound of formula I into a salt and/or a resultant salt into the free compound of formula I or into another salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.