Palladium-catalyzed ring-opening reactions of 1-acetyl-4-vinyl-2-azetidinones and 1-sulfonyl-2-vinylazetidines. Role of intramolecular participation of amide anion
摘要:
Ring opening reactions of 1-acetyl-4-vinyl-2-azetidinones in the presence of palladium(0)-n-Bu(3)P catalyst gave 2,4-pentadienamides in good yields, whereas 2-substituted-1,3-dienes were produced by the reaction of 1-sulfonyl-2-vinyl-2-methylazetidines. Ring opening dimerization took place to give 1,7-ditrifluoromethanesulfonyl-1,7-diazacyclododecane in the reaction of 1-trifluoromethanesulfonyl-2-vinylazetidine.
Decarboxylative Ring Contractions and Olefin Insertions of Vinyl Oxazinanones
作者:Chao Wang、Jon A. Tunge
DOI:10.1021/ol0610744
日期:2006.7.1
6-Vinyl oxazinanones undergo catalytic, diastereoselective, decarboxylative ring contraction to form vinyl azetidines in good yield. Performing the decarboxylation in the presence of Michael acceptors results in decarboxylative olefin insertion to provide diastereoenriched substituted vinyl piperidines.
Palladium-catalyzed ring-opening reactions of 1-acetyl-4-vinyl-2-azetidinones and 1-sulfonyl-2-vinylazetidines. Role of intramolecular participation of amide anion
Ring opening reactions of 1-acetyl-4-vinyl-2-azetidinones in the presence of palladium(0)-n-Bu(3)P catalyst gave 2,4-pentadienamides in good yields, whereas 2-substituted-1,3-dienes were produced by the reaction of 1-sulfonyl-2-vinyl-2-methylazetidines. Ring opening dimerization took place to give 1,7-ditrifluoromethanesulfonyl-1,7-diazacyclododecane in the reaction of 1-trifluoromethanesulfonyl-2-vinylazetidine.