General Allylic C–H Alkylation with Tertiary Nucleophiles
作者:Jennifer M. Howell、Wei Liu、Andrew J. Young、M. Christina White
DOI:10.1021/ja500726e
日期:2014.4.16
A general method for intermolecular allylic C–H alkylation of terminal olefins with tertiary nucleophiles has been accomplished employing palladium(II)/bis(sulfoxide) catalysis. Allylic C–H alkylation furnishes products in good yields (avg. 64%) with excellent regio- and stereoselectivity (>20:1 linear:branched, >20:1 E:Z). For the first time, the olefin scope encompasses unactivated aliphatic olefins
Oxidative palladium-catalyzed reaction conditions have been developed to allow for regioselective and stereoselective coupling of allylic boronic esters with a range of carbon-, oxygen-, and nitrogen-based nucleophiles. Studies into the mechanism of the reaction have shown that the key transmetalation step occurs with retention of stereochemistry, since overall inversion is observed.
Allylic CH Alkylation of Unactivated α-Olefins: Serial Ligand Catalysis Resumed
作者:Andrew J. Young、M. Christina White
DOI:10.1002/anie.201101654
日期:2011.7.18
A delicate interplay of several kinetically labile ligands is required for reactions that proceed through serial ligand catalysis mechanisms. An investigation of the disruption of this balance has enabled the development of a method for the intermolecular allylicCH alkylation of unactivated as well as activated α‐olefins (see example, Bn=benzyl).