Process for the preparation of thieno [3,2-c] pyridine and thieno [2,3-c] p y
US3969358A · kind A · utility
6Cited by
1References
7Claims
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Assignee
Inventor
Key dates
| Filing date | Jun 25, 1975 |
| Grant date | Jul 13, 1976 |
| Priority date | — |
| Expiry date | Jun 25, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of thieno[3,2-c]pyridine or thieno[2,3-c]pyridine, comprising cyclizing a N-(3-thienyl)-methyl-N-[ 2,2-(OR).sub.2 ]ethyl-para-toluene sulfonamide or a N-(2-thienyl)-methyl-N-[2,2-(OR).sub.2 ]ethyl-para-toluene sulfonamide, respectively, in which R is lower alkyl or both R groups form together a 2- or 3-membered alkylene radical, by treatment with an acid in the presence of an inert organic solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.