The present invention provides novel compound of the formulas (Ia) or (I):
wherein Q is one or two amino acid residues which may be substituted; R³ is a carboxyl group which may be esterified or an acyl group; A is an alkylene group; B is hydrogen or an alkyl group which may be substituted or an acyl group; or a salt thereof;
wherein R¹ and R² may be the same or different and each is hydrogen or a hydrocarbon residue which may be substituted; R³, A and B have the same definitions as those shown above; m and n each is 0 or 1; provided that where both m and n are both equal to 0, R³ is a carboxyl group which may be esterified or an acyl group having not less than 7 carbon atoms; or a salt thereof.
The compound (Ia) or (I) shows cathepsin L inhibitory and bone resorption inhibitory activities and are useful as a prophylactic/therapeutic agent for osteoporosis.
本发明提供了式 (Ia) 或 (I) 的新型化合物:
其中 Q 是一个或两个可被取代的
氨基酸残基;R³ 是可被酯化的羧基或酰基;A 是亚烷基;B 是氢或可被取代的烷基或酰基;或其盐;
其中R¹和R²可以相同或不同,且各自为氢或可被取代的烃残基;R³、A和B的定义与上表所示相同;m和n各自为0或1;但当m和n均等于0时,R³为可酯化的羧基或具有不少于7个碳原子的酰基;或其盐。
化合物(Ia)或(I)具有抑制 cathepsin L 和抑制骨吸收的活性,可用作骨质疏松症的预防/治疗剂。