Lipase-catalyzed enantioselective desymmetrization of prochiral 3,3-bis(hydroxymethyl)oxindoles
作者:Shuji Akai、Toshiaki Tsujino、Tadaatsu Naka、Kouichi Tanimoto、Yasuyuki Kita
DOI:10.1016/s0040-4039(01)01547-7
日期:2001.10
Oxindoles 3b–d (91–98% ee) having a chiral quaternary carbon center at the C-3 position were prepared from readily available oxindoles 5a–c in 50–64% overall yields, in which an enantioselective desymmetrization of prochiral 1,3-diols 2b–d using a Candida rugosa lipase (Meito OF) and 1-ethoxyvinyl 2-furoate 1 was employed as the key step.
羟吲哚3b的- d(91-98%ee)的具有在C-3位手性季碳中心从容易得到的羟吲哚制备了图5a - Ç在50-64%总产率,其中前手性的1,3-对映选择性desymmetrization采用皱纹念珠菌脂肪酶(Meito OF)和2-糠酸1-乙氧基乙烯基酯1制成的2- b - d二醇是关键步骤。