Direct transformation of dialkyl sulfates into alkyllithium reagents by a naphthalene-catalysed lithiation
作者:David Guijarro、Gabricia Guillena、Balbino Mancheño、Miguel Yus
DOI:10.1016/s0040-4020(01)87022-8
日期:1994.3
The lithiation of primary and secondary dialkyl sulfates with an excess of lithium powder in the presence of a catalytic amount of naphthalene (4 mol %) in THF at −78°C leads to the corresponding alkyllithium reagents (1:2 molar ratio) which react with different electrophiles, mainly carbonyl compounds, to yield after hydrolysis, the expected coupling products. This methodology represents an indirect
在-78°C下在THF中催化量的萘(4摩尔%)存在下,用过量的锂粉对伯和仲硫酸二烷基酯进行锂化反应,生成相应的烷基锂试剂(摩尔比为1:2)与不同的亲电试剂,主要是羰基化合物,水解后生成预期的偶联产物。该方法学代表通过相应的硫酸二烷基酯将醇转化为有机锂化合物的间接方法。当对五或六元环状硫酸盐(衍生自1,2-或1,3-二醇)进行相同操作时,仅获得分别由β-或γ-消除过程产生的产物(提供烯烃或环丙烷) 。