Asymmetric Friedel–Crafts alkylation of indoles with 3-nitro-2H-chromenes catalyzed by diphenylamine-linked bis(oxazoline) and bis(thiazoline) Zn(II) complexes
作者:Yang Jia、Wen Yang、Da-Ming Du
DOI:10.1039/c2ob25360g
日期:——
enantioselective Friedel–Crafts alkylation of indoles with 3-nitro-2H-chromenes catalyzed by diphenylamine-linked bis(oxazoline) and bis(thiazoline) Zn(II) complexes has been developed. This asymmetric Friedel–Crafts alkylation led to medicinally privileged indolyl(nitro)chromans in good yields with high enantioselectivities (up to 95% ee) and diastereoselectivities under mild reaction conditions.
“On-Water”-Promoted<i>C</i>-Alkylation of Indoles with 2-Aryl-3-nitro-2<i>H</i>-chromenes under Catalyst-Free Conditions
作者:Pateliya Mujjamil Habib、Veerababurao Kavala、B. Rama Raju、Chun-Wei Kuo、Wen-Chang Huang、Ching-Fa Yao
DOI:10.1002/ejoc.200900207
日期:2009.9
An environmentally benign method for the synthesis of indolyl(nitro)chromans from indoles and 2-aryl-3-nitro-2Hchromenes undercatalyst-freeconditions by use of an “onwater” concept is described. The salient features of the methodology are its clean reaction conditions, the eco-friendly