A one-pot synthesis of (E)-α-bromo-α,β-unsaturated esters and their trifluoromethylation: a general and stereoselective route to (E)-α-trifluoromethyl-α,β-unsaturated esters
摘要:
Bromination of a phosphonate anion derived in situ from ethyl bis (2,2 2 -trifluoroethyl)phosphonoacetate 3 followed by the addition of aldehydes produced (E)-alpha -bromo-alpha,beta -unsaturated esters 5 stereo selectively. The treatment of 5 with FSO2CF2CO2Me and CuI in DMF/HMPA provided (E)-alpha -trifluoromethyl-alpha,beta -unsaturated esters 6. (C) 2001 Elsevier Science Ltd. All rights reserved.
A simple base-mediated tandem SN2'/SNV reaction of readily available -trifluoromethyl-, -unsaturated carbonylcompounds with N-tosylated 2-aminomalonates was developed, which provide an efficient access to functionalized tetrasubstituted 2-fluoro-2-pyrrolines in good to...
A new route to α-trifluoromethyl-α,β-unsaturated esters
作者:Xingang Zhang、Feng-Ling Qing、Yonggang Yang、Jiang Yu、Xiang-Kai Fu
DOI:10.1016/s0040-4039(00)00279-3
日期:2000.4
The treatment of α-bromo-α,β-unsaturated esters with FSO2CF2CO2Me and CuI in DMF/HMPA constitutes a new synthetic scheme for the preparation of α-trifluoromethyl-α,β-unsaturated esters.
在DMF / HMPA中用FSO 2 CF 2 CO 2 Me和CuI处理α-溴-α,β-不饱和酯构成了制备α-三氟甲基-α,β-不饱和酯的新合成方案。
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)-glyceraldehydeacetonide, 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