Asymmetric Friedel-Crafts Alkylation of Indoles with Nitrodienes and 2-Propargyloxy-β-nitrostyrenes Catalyzed by Diphenylamine-Linked Bis(oxazoline)-Zn(OTf)2 Complexes
作者:Jiahuan Peng、Da-Ming Du
DOI:10.1002/ejoc.201200382
日期:2012.7
The catalytic asymmetricFriedel–Crafts reaction of indoles with nitrodienes and 2-propargyloxy-β-nitrostyrenes was systematically investigated with diphenylamine-linkedbis(oxazoline)–Zn(OTf)2 complexes. Moderate to good enantioselectivities were obtained with both kinds of substrates (up to 89 % ee for nitrodienes and up to 93 % ee for β-nitrostyrene derivatives). Further transformation of the corresponding