申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0027685A2
公开(公告)日:1981-04-29
An improved process for preparing imidazole and 1,2,4-triazole derivatives comprises the steps of:-
(a) reacting a β-keto ester R1-CO-CH2COOR with a a-halo ketone R2 COCH2X where X = halogen,
(b) hydrolysing the diketo ester to a diketone R1COCH2CH2COR
(c) oxidising the diketone esterto an unsaturated diketone
(d) reacting the unsaturated diketone with imidazole or 1,2,4-triazole
(e) selectively reducing the product of (d) to give a compound offormula:
wherein R' and R2 are optionally substituted alkyl, cycloalkyl or phenyl.
制备咪唑和 1,2,4-三唑衍生物的改进工艺包括以下步骤:- (a) β-酮酯 R1-CO-CH2COOR 与卤代酮 R2 COCH2X(其中 X = 卤素)反应;(b) 将二酮酯水解为二酮 R1COCH2CH2COR;(c) 将二酮酯氧化为不饱和二酮;(d) 将不饱和二酮与咪唑或 1,2,4-三唑反应;(e) 选择性还原(d)的产物,得到如下式的化合物:其中 R' 和 R2 是任选取代的烷基、环烷基或苯基。