申请人:BASF Aktiengesellschaft
公开号:US04673740A1
公开(公告)日:1987-06-16
2-Phenyl-4H-3,1-benzoxazin-4-ones of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or halogen, R.sup.1 may furthermore be methyl or methoxy and R.sup.2 may furthermore be haloalkyl, haloalkoxy, haloalkylmercapto or haloalkylsulfonyl, each of 1 to 3 carbon atoms, are prepared by reacting an appropriate anthranilic acid with an appropriate benzoyl halide in the presence of a base (acylation) and effecting ring closure by removal of water (cyclization), the process being carried out in a suspending agent which is immiscible with aqueous alkali metal hydroxide solution and in the presence of a phase-transfer catalyst.
通式I的2-苯基-4H-3,1-苯并噁嗪-4-酮化合物##STR1##其中R.sup.1和R.sup.2分别为氢或卤素,R.sup.1还可以是甲基或甲氧基,R.sup.2还可以是卤代烷基,卤代氧烷基,卤代烷基硫醇基或卤代烷基磺酰基,每个含有1至3个碳原子,通过在碱的存在下将适当的邻氨基苯甲酸与适当的苯甲酰卤反应(酰化),并通过去除水(环化)实现环闭合来制备,该过程在与水性碱金属氢氧化物溶液不相溶的悬浮剂中进行,并在相转移催化剂的存在下进行。