Enantioselective Mannich reaction of γ-malonate-substituted α,β-unsaturated esters with N-Boc imines catalyzed by chiral bifunctional thiourea-phosphonium salts
作者:Jiaxing Zhang、Gang Zhao
DOI:10.1016/j.tet.2018.12.052
日期:2019.3
A novel enantioselective Mannichreaction of γ-malonate-substituted α, β-unsaturated esters with N-protected arylaldimines was realized by using asymmetric phase-transfer catalysis (APTC). With amino acid-derived bifunctional thiourea-phosphonium salts as a catalyst, a series of enantio-enriched Mannich products could be synthesized under very mild and simple reaction conditions with high yields and
Asymmetric Synthesis of Polyfunctionalized Pyrrolidines via a Thiourea Catalyzed Domino Mannich/Aza-Michael Reaction
作者:Dieter Enders、Dominik P. Göddertz、Christian Beceño、Gerhard Raabe
DOI:10.1002/adsc.201000658
日期:2010.11.22
The dominoMannich/aza-Michaelreaction of γ-malonate-substituted α,β-unsaturated esters with N-protected arylaldimines has been achieved. Catalyzed by bifunctional thioureas, 2,5-cis-configured polysubstituted pyrrolidines are obtained in good to excellent yields (76–99%), enantioselectivities (75–94%) and excellent diastereoselectivities (de >95%). The pure stereoisomers are available by crystallization