The study in cascade reactions of Csp2-Csp cross-coupling(Sonogashira-type reaction)、cyclization and Csp2-S cross-coupling(Ullmann-type reaction) for one-pot three-step synthesis of benzo[b]thiophene derivatives using a simple copper-chloride system.
碩士 === 國立中興大學 === 化學系所 === 98 === It has been known that 2,3-disubstituted benzo[b]thiophenes have been prepared in excellent yields via coupling of terminal alkynes with commercially available o-iodothioanisole in the presence of a palladium catalyst and subsequent electrophilic cyclization of the...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/31214405631202089597 |
| Summary: | 碩士 === 國立中興大學 === 化學系所 === 98 === It has been known that 2,3-disubstituted benzo[b]thiophenes have been prepared in excellent yields via coupling of terminal alkynes with commercially available o-iodothioanisole in the presence of a palladium catalyst and subsequent electrophilic cyclization of the resulting o-(1-alkynyl)thioanisole derivatives.
We have developed a new synthetic method that by using copper choride-mediated cascade reactions of Csp2-Csp coupling, intramolecular cyclization, and Csp2-S coupling without using palladium catalyst and any ligand for one-pot three-step syntheses of 2,3-disubstituted benzo[b]thiophenes.
|
|---|