A process for preparing halogenated β -lactam compounds, characterized in that a β-lactam amino compound of the formula (1) is reacted with nitrous acid or nitrite in a slurry dispersion state in water, under acid condition in the presence of halogen molecules, thereby obtaining a halogenated β-lactam compound of the formula (4)
wherein n is an integer of 0 to 2; A is the formula (2) or (3); R1 and R2 are the same or different and are hydrogen atom, halogen atom, C1∼C3 alkyl group, C2∼C4 alkenyl group, C2 ∼C4 alkynyl group, nucleophilic group, or CH2R3; and R3 is halogen atom or nucleophilic group
wherein A is as defined above; X1 is hydrogen atom or halogen atom; and X2 is halogen atom.
1.一种制备卤代β-内酰胺化合物的工艺,其特征在于,将式(1)的β-内酰胺
氨基化合物在酸性条件下,在卤素分子存在的情况下,与
水中呈浆状分散状态的
亚硝酸或
亚硝酸盐反应,从而得到式(4)的卤代β-内酰胺化合物
其中 n 是 0 至 2 的整数;A 是式 (2) 或 (3);R1 和 R2 相同或不同,并且是氢原子、卤素原子、C1∼C3 烷基、C2∼C4 烯基、C2∼C4 炔基、亲核基团或 CH2R3;R3 是卤素原子或亲核基团。
其中 A 如上定义;X1 是氢原子或卤素原子;X2 是卤素原子。