Highly regio- and stereoselective hydrosilylation of β-fluoroalkylated α,β-unsaturated ketones
作者:Natsumi Ikeda、Tsutomu Konno
DOI:10.1016/j.jfluchem.2015.02.010
日期:2015.5
Treatment of β-fluoroalkylated α,β-unsaturated ketones with 10.2 equiv of triethylsilane in the presence of 3 mol% of Co2(CO)8 in dichloroethane at the reflux temperature for 4 h gave 1,4-hydrosilylated adducts in a highly regio- and stereoselective manner. Thus-obtained silyl enol ethers underwent a smooth Mukaiyama aldol reaction with benzaldehyde in the presence of 1.2 equiv of TiCl4 in CH2Cl2 at
在回流温度下,在二氯甲烷中有3 mol%的Co 2(CO)8存在下,用10.2当量的三乙基硅烷处理β-氟代烷基化的α,β-不饱和酮,反应时间为4 h,从而得到1,4-氢化硅烷化的加合物-和立体声选择的方式。由此获得的甲硅烷基烯醇醚在-78℃下在CH 2 Cl 2中在1.2当量的TiCl 4存在下与苯甲醛进行平滑的Mukaiyama aldol反应与苯甲醛反应1小时,得到相应的α-(2,2,2-三氟乙基)。高顺式立体选择性的)-β-羟基酮,收率高。