The enantioselective ethoxycarbonyldifluoromethylation of Morita–Baylis–Hillman (MBH) fluorides with Me3SiCF2CO2Et under organocatalysis is described. Moderately functionalized chiral gem-difluoromethylene compounds with a stereogenic “C-CF2-C*” unit were synthesized in high yields with high enantioselectivities. The initial C–F bond activation is assisted by the silicon atom via a dual SN2′-SN2′ stepwise
描述了在有机催化下,Meita -Baylis-Hillman(MBH)
氟化物与Me 3 SiCF 2 CO 2 Et的对映选择性乙氧基羰基二
氟甲基化。具有高收率和高对映选择性的具有立体感“ C-CF 2 -C *”单元的中度官能化手性宝石-二
氟亚甲基化合物可以合成。
硅原子通过双S N 2'-S N 2'逐步路径协助初始的CF键活化。MBH
氟化物的动态动力学拆分解释了该产品的高产率和高ee。该方法扩展到“ Het-CF 2 ”单元的对映选择性引入。