Ketone homologation to produce α-methoxyketones: application to conduritol synthesis
作者:Neil Phillipson、Michael S. Anson、John G. Montana、Richard J. K. Taylor
DOI:10.1039/a703073h
日期:——
The scope of Trost’s sulfone homologation procedure for the conversion of ketones into their α-methoxylated higher homologues has been dramatically expanded. The use of zirconium (or hafnium) tetrachloride in the hydroxy sulfone rearrangement step gives good yields with the adducts of aryl alkyl ketones, dialkyl ketones and cycloalkanones, and the rearrangement occurs with total regioselectivity. Mechanistic
Trost将酮转化为α-甲氧基化的高级同系物的砜同系物方法的范围已大大扩展。在羟基砜重排步骤中使用四氯化锆(或ha)可得到芳烷基酮,二烷基酮和环烷酮的加合物,收率良好,并且重排发生时具有全部区域选择性。提出了机械观察,其解释了作为副产物的α-羟基醛的形成,并且表明了制备它们的有效方法。描述了同源方法在二氢conduritols的立体选择性合成中的应用。