AbstractA novel, highly modular synthetic methodology with high functional group tolerance was developed for the construction of iminobenzoxazine derivatives from ortho‐cyanoanilides and diaryliodonium triflates via an oxidative arylation–cyclization path. The reaction is supposed to involve the formation of highly active aryl‐copper(III) species. In this novel transformation, copper(II) triflate was used as catalyst in 1,2‐dichloroethane or ethyl acetate and the reaction takes place at 75 °C in 2–16 h.magnified image
Rhodium-catalyzed asymmetric hydrogenation of β-acetylamino acrylonitriles
摘要:
The rhodium-catalyzed asymmetric hydrogenation of beta-acetylamino acrylonitriles was investigated by using monophosphine and bisphosphine ligands. It was found that an Rh-QuinoxP* complex exhibited high enantioselectivities for beta-aryl substituted beta-acetylamino acrylonitriles and the Rh-JosiPhos CyPF-t-Bu complex was proven to be effective for the hydrogenation of tetrasubstituted olefins from cyclic beta-acetylamino acrylonitriles. (C) 2011 Elsevier Ltd. All rights reserved.