Hydrated nickel (II) halides mediated ring opening reaction with N-tosylaziridines
作者:Wan Xuan Zhang、Wei Gang Hu、Li Su、Li Qin Liu
DOI:10.1016/j.cclet.2011.12.005
日期:2012.3
An efficient and water tolerant method for the synthesis of beta-haloamines is described utilizing hydrated nickel (II) halides (NiX2 center dot nH(2)O X = Cl, Br, I) and aziridines as starting materials. N-Tosylaziridines reacted with NiCl2 center dot 6H(2)O or NiI2 center dot 6H(2)O giving beta-chloro- or beta-iodoamines in high yields (73-99%) within a short time, but 10 mol% of n-Bu4NBr should be added in the reactions of N-tosylaziridines with NiBr2 center dot 3H(2)O in order to obtain the high yields of corresponding beta-bromoamines. Solvent played an important role in the reactions. The proper solvent for the reaction of NiCl2 center dot 6H(2)O was DMF, while NiBr2 center dot 3H(2)O or NiI2 center dot 6H(2)O proceeded well in 1,4-dioxane. (C) 2011 Wan Xuan Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.