[EN] PROCESS FOR PRODUCING TRIFLUOROMETHYL-SUBSTITUTED 2-ALKOXYACETOPHENONE DERIVATIVES<br/>[FR] PROCEDE DE PRODUCTION DE DERIVES DE 2-ALCOXYACETOPHENONE TRIFLUOROMETHYLE-SUBSTITUEE
申请人:CENTRAL GLASS CO LTD
公开号:WO2004014887A1
公开(公告)日:2004-02-19
A process for producing a brominated acetal (represented by the formula 3) includes (a) brominating a trifluoromethyl-substituted acetophenone by Br2 in the presence of an alkylene diol. It is optional to produce a trifluoromethyl-substituted 2-alkoxyacetophenone derivative (represented by the formula 9) by (b) reacting the brominated acetal with a metal alkoxide, thereby converting the brominated acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove an acetal group from the ether, thereby producing the 2-alkoxyacetophenone derivative. Alternatively, the 2-alkoxyacetophenone can be produced by (a) reacting a trifluoromethyl-substituted phenacyl halide with an acetalization agent, thereby converting the phenacyl halide into an acetal; (b) reacting the acetal with a metal alkoxide, thereby converting the acetal into an ether; and (c) hydrolyzing the ether in the presence of an acid catalyst to remove the acetal group from the ether.
生产溴代缩醛(化学式3)的过程包括:(a)在烷基二醇存在下,用Br2对三氟甲基取代的乙酰苯甲酮进行溴化。可以通过以下步骤制备三氟甲基取代的2-烷氧基乙酰苯甲酮衍生物(化学式9):(b)将溴代缩醛与金属烷氧化物反应,将溴代缩醛转化为醚;(c)在酸催化剂存在下水解醚,从而从醚中去除缩醛基,从而制备2-烷氧基乙酰苯甲酮衍生物。或者,可以通过以下步骤制备2-烷氧基乙酰苯甲酮:(a)将三氟甲基取代的苯甲酰卤与缩醛化试剂反应,将苯甲酰卤转化为缩醛;(b)将缩醛与金属烷氧化物反应,将缩醛转化为醚;(c)在酸催化剂存在下水解醚,从而从醚中去除缩醛基。