Enantioselective Synthesis of Cyclic, Quaternary Oxonitriles
作者:Yakup Güneş、M. Fatih Polat、Ertan Sahin、Fraser F. Fleming、Ramazan Altundas
DOI:10.1021/jo1011202
日期:2010.11.5
Quaternaryoxonitriles are stereoselectively generated from the union of five-, six-, and seven-membered 2-chloroalkenecarbonitriles with chiral alcohols via a Claisen rearrangement. The strategy rests on a new conjugate addition−elimination of allylic alkoxides to 2-chlorocycloalkenecarbonitriles to afford substituted 2-alkoxyalkenenitriles. Subsequent thermolysis unmasks a cyclicoxonitrile while
Lithium naphthalenide induced reductive alkylation of α-cyano ketones. A general method for regiocontrol of α, α-dialkylation of ketones
作者:Hsing-Jang Liu、Jia-Liang Zhu、Kak-Shan Shia
DOI:10.1016/s0040-4039(98)00780-1
日期:1998.6
An efficient generalmethod for the consecutive introduction of two alkyl groups to the α carbon of a ketone carbonyl has been developed, making use of the lithium naphthalenide induced reductive alkylation of an α-cyano ketone system as a key operation.
Synthesis and Enzymatic Kinetic Resolution of α,α-Disubstituted Cyclic Hydroxy Nitriles
作者:Laura M. Levy、Vicente Gotor
DOI:10.1021/jo035808r
日期:2004.4.1
Herein, we describe the diastereoselective synthesis of five- and six-membered α,α-disubstitutedcyclic β-hydroxy nitriles and their resolution via enzymatic transesterification. By this method, all possible stereoisomers were obtained in enantiopure form and high yield.