申请人:Mitsui Chemicals, Inc.
公开号:EP2088145A1
公开(公告)日:2009-08-12
The present invention provides a method of producing a 2-alkyl-3-aminothiophene derivative represented by formula (2) by reducing at least one of the 2-alkenyl-3-aminothiphene derivatives represented by formulae (1a) to (1d), or a mixture thereof, or a salt thereof, without using a protecting group for an amino group:
wherein in formulae (1a) to (1d), R1 to R4 each independently represents a hydrogen atom, an alkyl group of 1 to 12 carbon atoms or the like; and R5 and R6 each independently represents a hydrogen atom, a halogen atom, an alkyl group of 1 to 12 carbon atoms or the like. According to the invention, a 2-alkyl-3-aminothiophene derivative usable as an intermediate of agricultural chemicals can be produced by a cost-efficient industrial process, without the use of a high-cost protective group for an amino group.
本发明提供了一种生产式(2)代表的 2-烯基-3-氨基噻吩衍生物的方法,该方法通过还原式(1a)至(1d)代表的至少一种 2-烯基-3-氨基噻吩衍生物或其混合物或其盐,而不使用氨基的保护基团:
其中在式(1a)至(1d)中,R1至R4各自独立地代表氢原子、1至12个碳原子的烷基或类似物;R5和R6各自独立地代表氢原子、卤素原子、1至12个碳原子的烷基或类似物。根据本发明,一种可用作农用化学品中间体的 2-烷基-3-氨基噻吩衍生物可通过一种具有成本效益的工业工艺生产,而无需使用高成本的氨基保护基团。