A convenient method for the preparation of α,α-difloro-β-ketoesters and α,α-difluoroamides from terpenic and perfumery aldehydes
作者:Shoji Watanabe、Tsutomu Fujita、Masami Sakamoto、Hiromichi Takeda、Tomoya Kitazume、Takashi Yamazaki
DOI:10.1016/s0022-1139(96)03536-1
日期:1997.4
Reformatsky reactions with ethyl bromodifluoroacetate gave α,α-difluoro-β-hydroxyesters in good yield from the corresponding terpenic and perfumery aldehydes. α,α-Difluoro-β-ketoesters were prepared by Swern oxidation of the α,α-difluoro-β-hydroxyesters. The reaction of hydroxyesters with amines in the presence of lipase MY, lipase PS or Novozym 435 gave α,α-difluoroamides.
用溴二氟乙酸乙酯进行Reformatsky反应,由相应的萜烯和香料醛得到的α,α-二氟-β-羟基酯收率很高。通过对α,α-二氟-β-羟基酯进行Swern氧化制备α,α-二氟-β-酮酸酯。在脂肪酶MY,脂肪酶PS或Novozym 435的存在下,羟基酯与胺的反应产生了α,α-二氟酰胺。