发明公开
EP1018516A4 METHOD FOR CRYSTALLIZING MALEIC ACID SALT OF N-(1(S)-ETHOXYCARBONYL-3-PHENYLPROPYL)-L-ALANYL-L-PROLINE 审中-公开
方法晶性能(1(S) - 乙氧羰基-3-苯丙基)-L-丙氨酰-L-脯氨酸的N-马来酸盐

METHOD FOR CRYSTALLIZING MALEIC ACID SALT OF N-(1(S)-ETHOXYCARBONYL-3-PHENYLPROPYL)-L-ALANYL-L-PROLINE
摘要:
A method for crystallizing the maleic acid salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline (Enalapril) from an aqueous liquid with ease in good yield, which comprises mixing an aqueous liquid containing N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline, maleic acid and a base and having a pH of 4 or more with an acid in an amount of the acid sufficient to convert the base to a neutral salt, to thereby crystallize N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline in the form of a maleic acid salt.
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