A Metal-Free Three-Component Reaction of <i>trans</i>-β-Nitrostyrene Derivatives, Dibromo Amides, and Amines Leading to Functionalized Amidines
作者:Meng Zhou、Jinlei Li、Chao Tian、Xiao Sun、Xiaoting Zhu、Yaohang Cheng、Guanghui An、Guangming Li
DOI:10.1021/acs.joc.8b02998
日期:2019.1.18
metal-free, and multicomponent route for the preparation of N-acyl amidinesfrom nitroalkene derivatives, dibromo amides, and amines has been developed that accesses an initial α,α-dibromonitroalkane intermediate that can undergo C–C bond cleavage. This protocol offers an alternative approach toward N-acyl amidines and features the rapid construction of amidine frameworks with high diversity and complexity
Approach to Vicinal <i>t</i>-Boc-amino Dibromides via Catalytic Aminobromination of Nitrostyrenes without Using Chromatography and Recrystallization
作者:Hao Sun、Jianlin Han、Padmanabha V. Kattamuri、Yi Pan、Guigen Li
DOI:10.1021/jo302727v
日期:2013.2.1
A 1.0 mol % amount of K3PO4 center dot 3H(2)O was found to catalyze aminohalogenation reaction of nitrostyrenes with N,N-dibromo-tert-butylcarbamate (t-Boc-NBr2) in a dichloroethane system. Good to excellent yields and complete regioselectivity have been achieved by taking advantage of the GAP workup without using traditional purification techniques such as column chromatography and recrystallization. A new mechanism is proposed involving radical and ionic catalytic cycles and an intramolecular migration.