Remarkably Facile Solvolyses of Triflates via Carbocationic Processes in Dimethyl Sulfoxide
作者:Xavier Creary、Elizabeth A. Burtch
DOI:10.1021/jo0356558
日期:2004.2.1
A number of triflates have been shown to undergo clean pseudo-first-order solvolysis reactions in DMSO-d6 to give products derived from carbocationic intermediates. Thus, t-BuCH(OTf)CO-t-Bu (5) and t-BuCH2OTf (9) react readily in DMSO-d6 at 25 °C to give a rearranged oxosulfonium salts, and subsequent alkene products where methyl migration to the incipient cationic center occurs. t-BuCH(OTf)CO2CH3
已显示许多三氟甲磺酸酯在DMSO- d 6中进行了干净的拟一级溶剂分解反应,得到了衍生自碳阳离子中间体的产物。因此,t -BuCH(OTf)CO- t- Bu(5)和t -BuCH 2 OTf(9)在DMSO- d 6中在25°C下容易反应,得到重排的氧ulf盐,以及随后出现甲基迁移的烯烃产物到起始阳离子中心发生。t -BuCH(OTf)CO 2 CH 3(14)得到类似的重排产物,以及1-甲基环丙基三氟甲磺酸酯(21)得到开环的烯丙基氧ulf盐。这些主要三氟甲磺酸酯反应,经由ķ Δ通路。6-甲基双环[3.1.0]己-6-三氟甲磺酸酯(23),双环[2.2.1庚-1-基三氟甲磺酸酯(24),1,6-甲基[10]三氟甲磺酸十一烷基酯(25), (CH 3)2 C(OTf)CO 2 CH 3(26)和(CH 3)2 CCN(OTf)(29)都在DMSO- d 6中反应生成碳正离子衍生的产物。PhCH(OTf)CF