Trifluoromethylation of Alkenyl Bromides and Iodides (Including 5-Iodouracils) with (CF3)2Hgand Cu (“Trifluoromethylcopper”)1
摘要:
[GRAPHIC]Bromo- and iodoalkenes undergo trifluoromethylation efficiently in DMA with "CF3Cu" generated from (CF3)(2)Hg and Cu. Variable stereochemical inversion is observed with substrates having a gem-carbonyl group. Substrates having gem-hydrogen, -alkyl, or -alkenyl groups give products with stereochemical retention.
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。
α-Hypervalent Iodine Functionalized Phosphonium and Arsonium Ylides and Their Tandem Reaction as Umpolung Reagents
作者:Zhizhen Huang、Xiaochun Yu、Xian Huang
DOI:10.1021/jo026077i
日期:2002.11.1
iodine functionalized phosphonium and arsonium ylides 2 can be used as umpolung ylides to react with nucleophiles to give alpha-heteroatom substituted ylides 4 in good yields. The nucleophilic substitution-Wittig tandem reaction of 2 can occur smoothly to provide an efficient method for the synthesis of (Z)-alpha-halo-alpha,beta-unsaturated enoates or enones 6, stereoselectively.