New reactions of hydrazides. Part 1: Directed ortho- and lateral metalation of aromatic carbocyclic and heterocyclic systems
作者:Stuart W. McCombie、Sue-Ing Lin、Susan F. Vice
DOI:10.1016/s0040-4039(99)01876-6
日期:1999.12
Aromatic and heterocyclic 2,2-dialkylhydrazides undergo directed metalation with 2 equivalents of n-, s- or t-BuLi, and the resulting C,N-dilithio species react with a variety of electrophiles. The products may be readily converted to the corresponding carboxylic acids or esters by oxidation with manganese dioxide in water or methanol containing acetic acid.
芳香族和杂环2,2-二烷基肼与2个当量的n-,s-或t -BuLi进行定向金属化,所得的C,N-二硫代物质与各种亲电试剂反应。通过在水或含乙酸的甲醇中用二氧化锰氧化,可以容易地将产物转化为相应的羧酸或酯。