作者:Tatiana Besset、Thomas Poisson、Xavier Pannecoucke
DOI:10.1002/ejoc.201402937
日期:2014.11
An efficient synthesis of difluoromethylated alkynes is described. A panel of readily available CuI acetylides undergo direct difluoromethylation by using BrCF2CO2Et, which is an inexpensive, easy to handle, commercially available fluorinated reagent. The reaction, which is based on a Castro–Stephens transformation, proceeds smoothly under mild conditions offering a new synthetic route for the direct
描述了二氟甲基化炔烃的有效合成。一组现成的 CuI 炔化物通过使用 BrCF2CO2Et 进行直接二氟甲基化,这是一种廉价、易于处理的市售氟化试剂。该反应基于 Castro-Stephens 转化,在温和条件下顺利进行,为将二氟甲基化基团直接引入炔烃提供了一种新的合成途径,无需消耗臭氧层试剂。通过使用 CsOPiv 和 Cu(OAc)2 作为添加剂,以良好的收率获得了所得产物。