申请人:Novartis Corporation
公开号:US05659065A1
公开(公告)日:1997-08-19
Compounds of formula I ##STR1## wherein R.sub.1 is an aliphatic, cycloaliphatic, cycloaliphatic-aliphatic, aromatic or heteroaromatic radical, a hydroxy group that is aliphatically, araliphatically or heteroarylaliphatically etherified or protected by a hydroxy-protecting group, or an aliphatically etherified mercapto group, and R.sub.2 is an aliphatic, cycloaliphatic, cycloaliphatic-aliphatic, araliphatic or heteroarylaliphatic radical, or R.sub.1 and R.sub.2 together form a divalent aliphatic radical, R.sub.3 is free or aliphatically, araliphatically or aromatically esterified carboxy, formyl or hydroxymethyl, R.sub.4 is hydrogen, an aliphatic or araliphatic radical or an amino-protecting group, and R.sub.5 is hydrogen or an aliphatic radical, and the salts thereof can be used as intermediates in the preparation of medicinal active ingredients.
化合物公式I的化合物
其中R.sub.1是脂肪族,环脂族,环脂族-脂肪族,芳香族或杂环芳香族基团,是脂肪基,芳基或杂环基团的羟基,被脂肪基,芳基或杂环基团的羟基保护,或是脂肪基醚化的巯基,而R.sub.2是脂肪族,环脂族,环脂族-脂肪族,芳基或杂环芳香族基团,或R.sub.1和R.sub.2一起形成二价的脂肪基团,R.sub.3是自由的或脂肪基,芳基或芳基酯化的羧基,甲酰基或羟甲基,R.sub.4是氢,脂肪基或芳基基团或氨基保护基团,而R.sub.5是氢或脂肪基,其盐可以用作药用活性成分的制备中间体。