Asymmetric Homologation of Boronic Esters Bearing Azido and Silyloxy Substituents
作者:Rajendra Prasad Singh、Donald S. Matteson
DOI:10.1021/jo005522b
日期:2000.10.1
In the asymmetric homologation of boronicesters with a (dihalomethyl)lithium, substituents that can bind metal cations tend to interfere. Accordingly, we undertook the introduction of weakly basic oxygen and nitrogen substituents into boronicesters in order to maximize the efficiency of multistep syntheses utilizing this chemistry. Silyloxy boronicesters cannot be made efficiently by direct substitution