Direct synthesis of 3-halo-3-arylacrylonitriles from the addition of cyanoalkynes with alkaline metal halides
作者:Zhipeng Guan、Zhiwen Liu、Wei Shi、Hao Chen
DOI:10.1016/j.tetlet.2017.07.104
日期:2017.9
An efficient synthesis of 3-halo-3-arylacrylonitrile is described from the direct addition between cyanoalkynes and inorganic alkaline metal halides such as LiCl, LiBr and KI in good to satisfactory yields. No transition metal is needed for the synthesis of iodo- and bromo-products, although Pd catalyst is used to accelerate the chloro-product.
Treatment of arylacetylenes and cyanogen bromide in ClCH2CH2Cl with a catalytic amount of GaCl3 afforded (Z)-β-bromoacrylonitriles with high regio- and stereoselectivity.