申请人:Takasago International Corporation
公开号:EP0949247A1
公开(公告)日:1999-10-13
Disclosed is a process for economic, safe and simple production of a 2-phenyl-2-(2'-piperidinylidene)acetate derivative at a reduced number of steps in a high yield, which comprises allowing 2,3,4,5-Tetrahydro-6-methoxypyridine and a benzyl cyanide derivative represented by the following general formula (2):
wherein R1 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom or an amino group, to undergo condensation reaction in the presence of an organic base such as 1,8-diazabicyclo[5.4.0]-7-undecene or a transition metal complex as a catalyst to produce a 2-phenyl-2-(2'-piperidinylidene)acetonitrile derivative represented by the following general formula (4):
wherein R1 is as defined above; and the wavy line indicates a geometrical isomer, and then reacting with an alcohol in the presence of hydrogen chloride.
本发明公开了一种经济、安全和简单的 2-苯基-2-(2'-哌啶亚基)乙酸酯衍生物的生产工艺,该工艺减少了步骤,产率高,包括允许 2,3,4,5-四氢-6-甲氧基吡啶和由下通式(2)代表的苄基氰衍生物:
其中 R1 代表氢原子、低级烷基、低级烷氧基、卤素原子或氨基,在有机碱如 1,8-二氮杂双环[5.4.0]-7-十一烯或过渡金属络合物作为催化剂存在下进行缩合反应,生成下通式 (4) 所代表的 2-苯基-2-(2'-哌啶亚基)乙腈衍生物:
其中 R1 如上定义;波浪线表示几何异构体,然后在氯化氢存在下与醇反应。