Lewis Base Catalyzed, Enantioselective, Intramolecular Sulfenoamination of Olefins
摘要:
A method for the enantioselective, intramolecular sulfenoamination of various olefins has been developed using a chiral BINAM-based selenophosphoramide, Lewis base catalyst. Terminal and trans disubstituted alkenes afforded pyrrolidines, piperidines, and azepanes in high yields and high enantiomeric ratios via enantioselective formation and subsequent stereospecific capture of the thiiranium intermediate with the pendant tosyl-protected amine.
A highly enantioselective approach towards 2-substituted 3-bromopyrrolidines
作者:Jie Chen、Ling Zhou、Ying-Yeung Yeung
DOI:10.1039/c2ob25327e
日期:——
A facile and highly enantioselective approach towards 2-substituted 3-bromopyrrolidines has been developed. The process involves an amino-thiocarbamate catalyzed bromoaminocyclization of 1,2-disubstituted olefinic amides. The pyrrolidine products could readily be converted into other useful building blocks including a dihydropyrrole and a 2-substituted pyrrolidine.
Chiral Selenide-Catalyzed Enantioselective Construction of Saturated Trifluoromethylthiolated Azaheterocycles
作者:Jie Luo、Yannan Liu、Xiaodan Zhao
DOI:10.1021/acs.orglett.7b01392
日期:2017.7.7
An indane-based, bifunctional, chiral selenide catalyst has been developed. The new catalyst is efficient for the enantioselectivesynthesis of saturated azaheterocycles possessing a trifluoromethylthio group. The desired products were obtained in good yields with high diastereo- and enantioselectivities.
A catalytic enantioselective bromocyclization of olefinic amides using amino-thiocarbamates as the catalysts has been developed. The resulting enantioenriched 2-substituted 3-bromopiperidines can readily be transformed to 3-substituted piperidines through a silver salt-mediated rearrangement. This process has been applied to the synthesis of a dopaminergic drug, Preclamol.
作者:Danny E. Mancheno、Aaron R. Thornton、Armin H. Stoll、Aidi Kong、Simon B. Blakey
DOI:10.1021/ol101702w
日期:2010.9.17
A new catalyst system for intramolecular olefin aminoacetoxylation is described. In contrast to previously reported palladium- and copper-catalyzed systems, the conditions outlined in this communication favor piperdine formation with terminal olefin substrates and induce cyclization with traditionally less reactive disubstituted olefins.