Process for the preparation of compounds of formula (I) wherein R means hydrogen atom, or C1-6 alkyl group, or C7-12 aralkyl group or phenyl group, characterised in that a) the compound of formula (III) is reacted with a compound of formula (IV) wherein X means halogen atom or C1-5 alkoxy group or hydroxyl group, and the resulting compound of formula (II) is transformed, in a reaction medium with pH above 7, into the compound of formula (I) or b) the compound of formula (III) is reacted with an anhydride of general formula (V) and the resulting compound of formula (II) transformed, in a reaction medium with pH above 7, into the compound of formula (I), or c) a compound of formula (II) is transformed, in a reaction medium with pH above 7, into the compound of formula (I), and if desired, the resulting compounds of formula (I), before or after isolation, are transformed into acid addition salts, or the compounds of formula (I) are liberated from their acid addition salts. Thus a process for the preparation of intermediates useful in synthesis of angiotensin II antagonists is disclosed.
制备化合物的公式(I)的过程,其中R表示氢原子,或C1-6烷基,或C7-12芳基烷基或苯基,特征在于a)化合物的公式(III)与化合物的公式(IV)反应,其中X表示卤原子或C1-5烷氧基或羟基,得到的公式(II)化合物在pH大于7的反应介质中转化为公式(I)的化合物,或b)化合物的公式(III)与通式(V)的酸酐反应,得到的公式(II)化合物在pH大于7的反应介质中转化为公式(I)的化合物,或c)公式(II)的化合物在pH大于7的反应介质中转化为公式(I)的化合物,如有需要,得到的公式(I)化合物在分离之前或之后转化为酸盐,或者公式(I)的化合物从它们的酸盐中释放。因此,揭示了一种制备用于合成
血管紧张素II拮抗剂的中间体的过程。