4-Trifluoromethanesulfonamidyl prolinol tert-butyldiphenylsilyl ether as a highly efficient bifunctional organocatalyst for Michael addition of ketones and aldehydes to nitroolefins
作者:Chao Wang、Chun Yu、Changlu Liu、Yungui Peng
DOI:10.1016/j.tetlet.2009.02.211
日期:2009.5
4-Trifluoromethanesulfonamidyl prolinol tert-butyldiphenylsilyl ether bifunctionalorganocatalyst 3a is a highly efficient catalyst for the asymmetric Michaeladdition reactions of ketones and aldehydes to nitrostyrenes, leading to syn-selective adducts with excellent yields (>99%), high diastereoselectivities (up to 99:1 dr) and excellent enantioselectivities (up to 99% ee). Control experiments suggested that the
Chiral anthranilic pyrrolidine as custom-made amine catalyst for enantioselective Michael reaction of nitroalkenes with carbonyl compounds
作者:Yukari Oka、Seiji Tsuzuki、Katsuhiko Moriyama
DOI:10.1039/d1cc04453b
日期:——
pyrrolidine catalyst as a custom-made amine-catalyst was developed for the enantio- and diastereo selective Michael reaction of nitroalkenes with carbonylcompounds. In particular, a peptide-like catalyst in which an α-amino acid is attached to the anthranilic acid skeleton induced the high stereoselectivity of the reaction with aldehydes. Studies of the reaction mechanism indicated that the catalyst exhibits
Prolinol Sulfinyl Ester
Derivatives: Organocatalytic Michael Addition of Ketones
to Nitroolefins under Neat Conditions
作者:Guofu Zhong、Xiaofei Zeng
DOI:10.1055/s-0029-1216637
日期:——
Highlyenantioselective and diastereoselective Michaeladdition of ketones to nitroolefins catalyzed by prolinol sulfinyl ester was achieved in excellent yields under solvent-free conditions at room temperature. catalysis - asymmetric synthesis - ketones - sulfinates - Michaeladditions - nitro compounds
A new type of organocatalyst for highly stereoselective Michael addition of ketones to nitroolefins on water
作者:Siang-en Syu、Tzu-Ting Kao、Wenwei Lin
DOI:10.1016/j.tet.2009.11.093
日期:2010.1
prepared in three steps from (S)-N-Boc-2-[((4-toluenesulfonyl)oxy)methyl]pyrrolidine in 62% overall yield, was used as a new type of organocatalyst bearing a pyrrolidine and a sulfone moiety. It shows very high catalytic activity toward the direct asymmetric Michael reaction of cyclohexanone and nitroolefins. All the corresponding adducts can be furnished in 90–99% yields and with up to 98% ee and
Pyrrolidine-linker-camphor assembly: bifunctional organocatalysts for efficient Michael addition of cyclohexanone to nitroolefins under neat conditions
new class of pyrrolidinyl–camphor based bifunctionalorganocatalysts possessing varying functional linkers. Catalytic screening of these camphor–pyrrolidine linked derivatives for asymmetric Michael reaction of cyclohexanone with β-nitrostyrene was carried out. Various aryl- and heteroaryl-nitroolefins, ketones as well as aldehydes gave the corresponding Michael adducts in high chemical yields (up to