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 trichlorolsocyanuric 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.
这项发明涉及一种制备α-
氯酮化合物的过程,包括以下步骤:(i) 环化炔基酰胺以形成5-亚甲基
噁唑啉;(ii) 使用三
氯异
氰酸氯化5-亚甲基
噁唑啉以产生
氯化
噁唑啉中间体;(iii) 用
水酸处理
氯化
噁唑啉中间体以生成所需的单
氯酮,其中Z是烷基或取代烷基、芳基或取代芳基、杂环芳基或取代杂环芳基或苯基,R是氢原子或烷基,R.sup.1和R.sup.2分别独立地是烷基或取代烷基基团,或者R.sup.1和R.sup.2与它们连接的碳原子一起形成一个环状结构。此外,当R是氢原子时,可以通过调整反应条件方便地形成二
氯酮。