Stereodivergent Construction of Vicinal Acyclic Quaternary–Tertiary Carbon Stereocenters by Michael-Type Alkylation of α,α-Disubstituted <i>N</i>-<i>tert</i>-Butanesulfinyl Ketimines
作者:Nuermaimaiti Yisimayili、Hui Liu、Yun Yao、Chong-Dao Lu
DOI:10.1021/acs.orglett.1c02660
日期:2021.10.1
constructed with excellent stereoselectivity via aza-enolization of enantioenriched acyclic N-tert-butanesulfinyl ketimines bearing two sterically similar α-linear alkyl substituents followed by conjugate addition to nitroalkenes. Further changes of the absolute configuration of the sulfinyl group and/or the α-stereocenter in the ketimine allowed the facile stereodivergent synthesis of all four diastereomers
Enantioselective Synthesis of α-Chiral Amides by Catalytic Hydrogenation with Iridium N,P-Complexes
作者:Bram B. C. Peters、Norman Birke、Pher G. Andersson、Luca Massaro
DOI:10.1055/s-0042-1751399
日期:——
The catalytic asymmetric hydrogenation of olefins constitutes a powerful method for the preparation of chiral compounds. A series of prochiral unsaturated amides were efficiently reduced with high enantioselectivities by means of an iridium N,P-complex-catalyzed hydrogenation. Its application in the synthesis of fenpropidin and the possibility of using isomeric mixtures of starting materials are attractive
Highly Enantioselective Construction of the α-Chiral Center of Amides<i>via</i>Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Amides
作者:Wei-Jing Lu、Xue-Long Hou
DOI:10.1002/adsc.200900080
日期:2009.6
Abstractmagnified imageThe chiral center at the α‐position of amides is installed in excellent enantioselectivity via the iridium‐catalyzed asymmetric hydrogenation of α,β‐unsaturated amides under mild conditions. Even aliphatic amides are suitable substrates. The presence of a hydrogen atom on the nitrogen of the amide is important for the enantioselectivity of the reaction.