Synthesis of intermediates useful in preparing bromo-substituted tricyclic compounds
US5760232A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1997 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Jun 16, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D401/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for preparing a compound of the formula ##STR1## comprising: (a) reacting 2,5-dibromo-3-methylpyridine with an amine of the formula NHR.sup.5 R.sup.6 to obtain an amide; PA1 (b) reacting the amide with a compound of formula 3 ##STR2## in the presence of a strong base to obtain a compound of formula 4 ##STR3## (c) converting a compound of formula 4 to the corresponding cyano compound or aldehyde; PA1 (d) reacting the cyano compound or aldehyde with a piperidine derivative to obtain an aldehyde or alcohol of formula 7a or 7b, respectively: ##STR4## (e) cyclizing a compound of formula 7a or 7b; wherein R.sup.1 -R.sup.7 are as defined in the specification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.