Synthesis of 2‘,3‘-Dideoxy-2‘-trifluoromethylnucleosides from α-Trifluoromethyl-α,β-unsaturated Ester
作者:Xingang Zhang、Feng-Ling Qing、Yihua Yu
DOI:10.1021/jo005520r
日期:2000.10.1
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。