A process is disclosed for the manufacture of 1-substituted amino-1-substituted thio-2 nitro alkenes of the general formula: (R1NH) (R2S) C.dbd.CR3 (NO2) wherein R1, R2, R3, may be same or different and may consist of hydrogen, alkyl, aryl or arylalkyl groups or combinations thereof. These alkenes are prepared by reacting a primary amine with a compound of sulfur in the presence of a primary catalyst to obtain a carbonimidodithioic acid salt which is converted to a corresponding ester which is thereafter reacted with a nitro compound in the presence of a secondary catalyst. 1-methylamino-1-methylthio-2-nitroethene is an important intermediate in the synthesis of Rantitidine and Nizatidine which are used as effective drugs in the treatment of peptic ulcers and associated gastrointestinal disorders.
本发明揭示了一种制备通式为(R1NH)(R2S)C.dbd.CR3(
NO2)的1-取代
氨基-1-取代
硫-2-硝基烯的方法,其中R1、R2、R3可以相同也可以不同,可以包括氢、烷基、芳基或芳基烷基或它们的组合。这些烯烃是通过在一种初级催化剂的存在下,将一种初级胺与
硫化合物反应制备得到一种碳亚
氨基二
硫酸盐,然后将其转化为相应的酯,随后在一种次级催化剂的存在下与
硝基化合物发生反应制备而得。1-甲基
氨基-1-甲基
硫-2-
硝基乙烯是在合成
雷尼替丁和
尼扎替丁时的重要中间体,它们被用作治疗消化性溃疡和相关胃肠道疾病的有效药物。