名称:
Alkylidenation of esters on solid support and traceless synthesis of 2-substituted benzofurans
摘要:
Polymer-supported esters are smoothly converted into enol ethers using a titanocene alkylidene prepared by treatment of 2-tert-butyldimethylsilyloxybenzaldehyde diphenyldithioacetal with the low valent titanium species Cp2Ti[P(OEt)(3)](2). Treatment of the enol ethers with acid leads to the release of ketones from the Wang resin in high yield. Traceless solid-phase synthesis of 2-substituted benzofurans is achieved in a three-step termination procedure. (C) 2000 Published by Elsevier Science Ltd.
DOI:
10.1016/s0040-4039(00)00753-x