Four-Component Reaction of <i>N</i>-Sulfonylimines, (Cyanomethylene)triphenylphosphorane, Nitromethane, and Formaldehyde for the Synthesis of 3-Substituted 2-Methylene-4-nitrobutanenitriles JinYin-Huan FangFan ZhangXiang LiuQing-Zhou WangHao-Bo TianShi-Kai 2011 An efficient four-component synthesis of 3-substituted 2-methylene-4-nitrobutanenitriles has been developed from <i>N</i>-sulfonylimines, (cyanomethylene)triphenylphosphorane, nitromethane, and formaldehyde in the absence of catalysts and additives at room temperature.