Controlling the regioselectivity of lithiation using kinetic isotope effects: Deuterium as a protecting group for carbon
作者:Jonathan Clayden、Jennifer H. Pink、Neil Westlund、Francis X. Wilson
DOI:10.1016/s0040-4039(98)01930-3
日期:1998.11
By substituting deuterium for hydrogen at positions of high kinetic acidity in amides and carbamates, the usual regiochemical course of their reactions with alkyllithiums (ortholithiation vs. lateral lithiation vs. nucleophilic addition) can be altered or overturned by the kinetic isotope effect. The deuterium substituent functions in these reactions as a protecting group for carbon.
通过在酰胺和氨基甲酸酯高动能酸度位置代替氢氘,它们与烷基锂反应(ortholithiation的通常区域化学过程与横向锂化相对于亲核加成)可以被改变或由动力学同位素效应推翻。氘取代基在这些反应中用作碳的保护基。