New reductive benzylation of hydroxy functions was effected by using the combination of benzaldehyde, TMSCl, and Et3SiH. TMSCl first reacts with alcohols to form HCl, which is probably the ultimate catalyst for this reaction system. TMSCl can also trap water and thus effectively promote dehydration reactions when more than stoichiometric amount of TMSCl is used. Although excess TMSCl was required for the foregoing reactions, TMSCl could be readily removed by simple evaporation.
利用
苯甲醛、TMSCl 和 Et3SiH 的组合实现了羟基官能团的新还原苄基化。TMSCl 首先与醇反应生成 HCl,这可能是该反应体系的最终催化剂。当使用的 TMSCl 超过一定量时,TMSCl 还能截留
水分,从而有效促进脱
水反应。虽然上述反应需要过量的 TMSCl,但只需简单蒸发就能轻松去除 TMSCl。