Novel catalytic hydrogenolysis of silyl enol ethers by the use of acidic ruthenium dihydrogen complexes
作者:Izuru Takei、Yoshiaki Nishibayashi、Youichi Ishii、Yasushi Mizobe、Sakae Uemura、Masanobu Hidai
DOI:10.1016/s0022-328x(03)00470-4
日期:2003.8
to afford the corresponding ketones and trialkylsilanes. The direct proton transfer from H2 to the trimethylsilyl enol ethers (1a and 1d–1f) was confirmed by the experiments employing D2 gas, where α-monodeuterated ketones (3a′ and 3d′–3f′) were obtained in high yields. The enantioselective protonation of prochiral silyl enol ethers with 1 atm of H2 by employing [RuCl(η2-H2)((S)-BINAP)2]OTf (4e) [BINAP=2
1-三甲基硅氧基-1-环己烯(治疗1A在酸性二氢复杂将[RuCl(η催化量的存在下)2 -H 2)(DPPE)2 ]光学传递函数(图4a)[DPPE = 1,2-双(二苯基膦基)乙烷,OTf = OSO 2 CF 3 ](10 mol。%)在1 atm的H 2下在无水ClCD 2 CD 2 Cl中于50°C加热8 h,得到环己酮(3a)和Me 3 SiH产量。甲硅烷基烯醇醚,如1-三乙基甲硅烷氧基-1-环己烯(1b),1-叔丁基二甲基甲硅烷氧基-1-环己烯(1c),其他三甲基甲硅烷基醚(1d,1e和1f)与H 2类似地反应,得到相应的酮和三烷基硅烷。选自H直接质子转移2到三甲基硅烯醇醚(1A和1D - 1F)通过采用d的实验证实2气体,其中α-monodeuterated酮类(3A '和3D - ' 3F以高收率获得')。的对映选择性质子化的前手性的甲硅烷基烯醇醚与1 h的大气压2通过采用将[RuCl(η