Synthesis and application of α-trifluoromethylated aldehydes
作者:Tsutomu Konno、Takashi Yamazaki、Tomoya Kitazume
DOI:10.1016/0040-4020(95)00863-4
日期:1996.1
for the synthesis of α-trifluoromethylatedaldehydes are described. One is a synthetic method via Pummerer rearrangement followed by the hydrolysis under the weakly basic condition, giving the recemic aldehyde. The other is via the oxidative cleavage of the corresponding diol under the acidic condition, affording the optically active compound for the first time. Furthermore, both aldehydes underwent
(R;E)-3,3,3-Trifluoroprop-1-enylp-tolylsulphoxide, prepared in three steps from ethyl trifluoroacetate, showed a high degree of diastereoselectivity in Michaeladditionreactions with enolates; by this means, optically active trifluoromethylated organic molecules can be obtained readily in high yield as well as in high optical purity.