申请人:Sumitomo Chemical Company, Limited
公开号:EP1997802A1
公开(公告)日:2008-12-03
An object of the present invention is to industrially advantageously produce N-nitroisoureas or a salt thereof which is useful as a synthetic intermediate for pharmaceuticals and pesticides. The present invention relates to a process for producing a compound represented by the formula (2):
wherein R1, R2 and R3 are as defined below, or a salt thereof, which comprises reacting a compound represented by the formula (1):
wherein R1 represents an optionally substituted straight-chain or branched C1 to C6 alkyl group, R2 and R3 are the same or different and represent an optionally substituted straight-chain or branched C1 to C6 alkyl group, a cycloalkyl group or a substituted aryl group, or R2 and R3 simultaneously represent a hydrogen atom, or a salt thereof with a nitrating agent in the presence of sulfur trioxide.
本发明的目的是在工业上有利地生产 N-硝基异脲或其盐类,它们可用作医药和杀虫剂的合成中间体。本发明涉及一种生产由式(2)代表的化合物的工艺:
其中 R1、R2 和 R3 如下文所定义,或其盐的工艺,该工艺包括使式 (1) 所代表的化合物反应:
其中 R1 代表任选取代的直链或支链 C1 至 C6 烷基,R2 和 R3 相同或不同并代表任选取代的直链或支链 C1 至 C6 烷基、环烷基或取代的芳基,或 R2 和 R3 同时代表氢原子,或其盐与硝化剂在三氧化硫存在下反应。