A highly convenient and efficient process for economically producing in a high yield high-quality captopril which is remarkably reduced in the content of impurities and has a high melting point and intermediates for synthesizing the same which contain only a small amount of precursors as impurities and have excellent qualities. The process comprises subjecting an acid halide and an L-proline to the Schotten-Baumann reaction and eliminating the impurities formed as the by-products in the form of the precursors represented by general formula (5) or (6) by treating, during or after the Schotten-Baumann reaction, the aqueous medium solution with active carbon or crystallization followed by deacylation. In the formula, R1 represents acyl and n represents an integer of from 2 to 4.
一种非常方便和高效的工艺,可以经济地高产率生产出杂质含量显著降低、熔点高的高质量
卡托普利,以及仅含有少量前体杂质、质量上乘的合成
卡托普利的中间体。该工艺包括将酸卤化物和
L-脯氨酸进行肖滕-鲍曼反应,并通过在肖滕-鲍曼反应期间或之后用活性碳处理
水介质溶液或结晶,然后进行脱乙酰化,以通式(5)或(6)代表的前体形式消除作为副产物形成的杂质。式中,R1 代表酰基,n 代表 2 至 4 的整数。