Titanium-promoted highly stereoselective synthesis of α,α-difluoro-β,γ-dihydroxyester. Simple route to 2-deoxy-2,2-difluororibose
作者:Yasushi Matsumura、Hajime Fujii、Toshiaki Nakayama、Yoshitomi Morizawa、Arata Yasuda
DOI:10.1016/s0022-1139(00)82832-8
日期:1992.4
The highly stereoselective synthesis of α,α-difluoro-β,γ-dihydroxyesters is described. Reformatsky reaction of bromo- or iododifluoroacetate with D-glyceraldehyde provided (3R, 4R)-2,2-difluoro-4,5-O-cyclohexylidene-3-triethylsiloxypentanoic acid ethyl ester in high yield, with more than 95% diastereoselectivity, by asymmetric induction promoted by Cp2TiCl2. The reaction affords a simple and practical
描述了α,α-二氟-β,γ-二羟基酯的高度立体选择性合成。溴-或碘代二氟乙酸酯与D-甘油醛的Reformatsky反应以高收率提供了(3 R,4 R)-2,2-二氟-4,5 - O-环己叉基-3-三乙基甲硅烷氧基戊酸乙酯,非对映选择性超过95% ,由Cp 2 TiCl 2促进的不对称诱导。该反应提供了一种简单而实用的制备2-脱氧-2,2-二氟核糖的途径。