This invention relates to a process for the preparation of an .alpha.-chloroketone compound comprising the steps of (i) cyclizing an alkynyl amide to form a 5-methyleneoxazoline ##STR1## (ii) chlorinating the 5-methyleneoxazoline using trichloroisocyanuric acid to produce a chlorinated oxazoline intermediate ##STR2## and (iii) hydrolyzing the chlorinated oxazoline intermediate with an aqueous acid to produce the desired monochloroketone ##STR3## wherein Z is alkyl or substituted alkyl, aryl or substituted aryl, heteroaryl or substituted heteroaryl or phenylene, R is a hydrogen atom or alkyl, and R.sup.1 and R.sup.2 are each independently an alkyl or substituted alkyl group, or R.sup.1 and R.sup.2 together with the carbon atom to which they are attached form a cyclic structure. Additionally, when R is a hydrogen atom, a dichloroketone can be conveniently formed through adjustment of reaction conditions.
该发明涉及一种制备α-
氯酮化合物的方法,包括以下步骤:(i) 环化炔基酰胺以形成5-亚甲氧
噁唑啉;(ii) 使用三
氯异
氰酸氯化5-亚甲氧
噁唑啉,生成
氯化
噁唑啉中间体;(iii) 用
水溶酸
水解
氯化
噁唑啉中间体,生成所需的单
氯酮,其中Z为烷基或取代烷基、芳基或取代芳基、杂芳基或取代杂芳基或苯基,R为氢原子或烷基,R.sup.1和R.sup.2各自独立为烷基或取代烷基,或R.sup.1和R.sup.2与它们连接的碳原子一起形成环状结构。此外,当R为氢原子时,通过调整反应条件可以方便地形成二
氯酮。