A New, Mild, and Efficient Synthesis of 2,2-Difluoro-3-hydroxyacids through a Selective Haloform Reaction
作者:O. Jiménez、M. P. Bosch、A. Guerrero
DOI:10.1021/jo0518856
日期:2005.12.1
2-difluoro-3-hydroxyacids have been synthesized in a new, straightforward manner by treatment of 4-hydroxy-1,1,1,3,3-pentafluoroalkyl ketones, easily obtained by reaction of pentafluoroenolate 2 with aldehydes and ketones, with base under mild conditions. The reaction sequence is marked by the selective cleavage of the CO−CF3 bond, as well as the absence of products arising from the alternative CO−CF2R bond cleavage
通过处理4-羟基-1,1,1,1,3,3-五氟烷基酮,可以很容易地通过五氟烯酸酯2与醛反应得到4-羟基-1,1,1,3,3-五氟烷基酮,以一种新的,直接的方式合成长链2,2-二氟-3-羟基酸和酮,在温和条件下具有碱。该反应序列的特征是CO-CF 3键的选择性裂解,以及不存在因CO-CF 2 R键的替代裂解而产生的产物。该方法代表了合成2,2-二氟-3-羟基酸的简便方法,因为它简短,在温和条件下可提供良好至优异的收率,并使用非常便宜的试剂六氟-2-丙醇作为氟。来源。