Polymer-Supported Hantzsch 1,4-Dihydropyridine Ester: An Efficient Biomimetic Hydrogen Source for the Reduction of Ketimines and Electron-Withdrawing Group Conjugated Olefins
作者:Jun Che、Yulin Lam
DOI:10.1002/adsc.201000093
日期:——
A polymer‐supported Hantzsch 1,4‐dihydropyridine ester was observed to be a useful selective reducing agent for the reduction of ketimines and electron‐withdrawing conjugatedolefins. The rate of the reduction of electron‐withdrawing conjugatedolefins is dependent on the nature of the conjugated substituents and could be enhanced by microwave irradiation. The reduction of (Z)‐α‐cyano‐β‐bromomethylcinnamates
Superbase-Promoted Addition of Acetylene Gas to the C=N Bond
作者:Elena Yu. Schmidt、Ivan A. Bidusenko、Nadezhda I. Protsuk、Yan V. Demyanov、Igor A. Ushakov、Boris A. Trofimov
DOI:10.1002/ejoc.201900932
日期:2019.9.15
Acetylene gas readily adds to the C=N bond of ketimines in KOtBu/DMSO solution at room temperature to afford terminal propargylamines with a quaternary carbon center in up to 94 % yield. The reaction represents a new Csp3–Csp bond formation under mild transition metal free conditions using available widespread starting materials covering a broad scope of ketimines.