A General Organocatalytic System for Enantioselective Radical Conjugate Additions to Enals
作者:Emilien Le Saux、Dengke Ma、Pablo Bonilla、Catherine M. Holden、Danilo Lustosa、Paolo Melchiorre
DOI:10.1002/anie.202014876
日期:2021.3
enantioselective conjugate addition of carbon‐centered radicals to aliphatic and aromatic enals. The process uses an organic photoredox catalyst, which absorbs blue light to generate radicalsfrom stable precursors, in combination with a chiral amine catalyst, which secures a consistently high level of stereoselectivity. The generality of this catalytic platform is demonstrated by the stereoselective interception
α-Alkyl-α-aminosilanes. 2. A2H NMR study of organolithium stabilization by silicon and by phenyl in solution
作者:Scott McN. Sieburth、Joseph J. Somers
DOI:10.1016/0040-4020(96)00191-3
日期:1996.4
tert-ButylN-phenylmethyl-N-trimethylsilylmethyl carbamate is metalated at two positions: alpha to silicon and alpha to phenyl. The ratio of these metalation products was followed by deuteration and deuterium NMR. Kinetic deprotonation slightly favors the α-silyl anion but equilibrating conditions strongly favors the α-phenyl anion.