申请人:ROHM AND HAAS COMPANY
公开号:EP0872474A2
公开(公告)日:1998-10-21
This invention relates to a process for the preparation of an α-chloroketone compound comprising the steps of
(i) cyclizing an alkynyl amide to form a 5-methyleneoxazoline
(ii) chlorinating the 5-methyleneoxazoline using trichloroisocyanuric acid to produce a chlorinated oxazoline intermediate
and
(iii) hydrolyzing the chlorinated oxazoline intermediate with an aqueous acid to produce the desired monochloroketone
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
R1 and R2 are each independently an alkyl or substituted alkyl group, or R1 and R2 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.
本发明涉及一种制备α-氯酮化合物的工艺,包括以下步骤
(i) 环化炔酰胺形成 5-亚甲基噁唑啉
(ii) 使用三氯异氰尿酸氯化 5-亚甲基噁唑啉,生成氯化噁唑啉中间体
和
(iii) 用水性酸水解氯化噁唑啉中间体,生成所需的一氯酮
其中
Z 是烷基或取代烷基、芳基或取代芳基、杂芳基或取代杂芳基或亚苯基、
R 是氢原子或烷基,以及
R1 和 R2 各自独立地为烷基或取代烷基,或 R1 和 R2 与它们所连接的碳原子一起形成环状结构。
此外,当 R 为氢原子时,可通过调整反应条件方便地形成二氯酮。