An industrially advantageous process for producing 3-chloromethyl-3-cephem derivative crystals. The process for 3-chloromethyl-3-cephem derivative production comprises: a first step in which a thiazolineazetidinone derivative (1) is reacted with a sulfonyl halide (2) in the presence of an acid in a solvent to obtain an azetidinone derivative (3); a second step in which the azetidinone derivative (3) is reacted with a chlorinating agent in an organic solvent to obtain a chlorinated azetidinone derivative (4); and a third step in which the chlorinated azetidinone derivative (4) is reacted with an alcoholate (5) at a pH of 8 or lower in a solvent comprising an alcohol and an ether and a 3-chloromethyl-3-cephem derivative (6) is recovered in the form of crystals.
一种工业上优势的生产3-
氯甲基-3-头孢烯衍
生物晶体的方法。该3-
氯甲基-3-头孢烯衍
生物生产方法包括:第一步,在溶剂中,在酸的存在下,将
噻唑啉氮杂环衍
生物(1)与
磺酰卤化物(2)反应,得到
噻唑啉环衍
生物(3);第二步,在有机溶剂中,将
噻唑啉环衍
生物(3)与
氯化试剂反应,得到
氯化
噻唑啉环衍
生物(4);第三步,在包含醇和醚的溶剂中,在pH值为8或更低的条件下,将
氯化
噻唑啉环衍
生物(4)与醇酸盐(5)反应,以晶体形式回收3-
氯甲基-3-头孢烯衍
生物(6)。