beta-unsaturated esters 3. The trifluoromethylation of (Z)/(E)-ethyl 3-[(S)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-bromo-2-propenoate (2e), which is derived from 1-(R)-glyceraldehyde acetonide, yields the key intermediate alpha-trifluoromethyl-alpha,beta-unsaturated esters 3e. This is transformed into anomeric acetates 8a and 8b and is used for the synthesis of a number of 2', 3'-dideoxy-2'-trifluoromethylnucleosides
在
DMF / HMPA中用FSO(2)CF(2)CO(2)Me和CuI处理α-
溴-α,β-不饱和酯2构成了制备α-三
氟甲基-α,β的新合成方案-不饱和酯3.(Z)/(E)-乙基3-[((S)-2,2-二甲基-
1,3-二氧戊环-4-基] -2-
溴-2-
丙酸酯(2e)的三
氟甲基化衍生自1-(R)-
甘油醛
丙酮化物的)生成关键中间体α-三
氟甲基-α,β-不饱和酯3e。将其转化为异头
乙酸酯8a和8b,并用于合成许多2',3'-二脱氧-2'-三
氟甲基核苷。