A compound of the formula [I] or a pharmaceutically acceptable salt thereof,
wherein,
R¹ and R² are the same or different and each is hydrogen or lower alkyl;
R³ and R⁴ are the same or different and each is hydrogen, lower alkyl, carboxy or lower alkoxycarbonyl;
R⁵ is hydrogen or lower alkyl;
X is oxygen or NR⁶;
R⁶ is hydrogen, lower alkyl, lower alkoxy, phenyl lower alkyl or phenyl lower alkoxy, and the said lower alkyl can be substituted by carboxy, lower alkoxycarbonyl, amino, lower alkylamino, lower alkoxycarbonylamino or phenyl lower alkylamino, and the phenyl ring of the said phenyl lower alkyl, phenyl lower alkoxy or phenyl lower alkylamino can be substituted by lower alkyl, lower alkoxy, halogen, carboxy or lower alkoxycarbonyl;
A is straight or branched lower alkylene,
n is 0 or 1. Such compound is useful for the treatment of various diseases caused by immune disorders such as immunodeficiency and autoimmune diseases.
式 [I] 的化合物或其药学上可接受的盐、
其中
R¹ 和 R² 相同或不同,且各自为
氢或低级烷基;
R³ 和 R⁴ 相同或不同,且各自为
氢、低级烷基、羧基或低级烷
氧基羰基;
R⁵ 是
氢或低级烷基;
X 是
氧或 NR⁶;
R⁶ 是
氢、低级烷基、低级烷
氧基、
苯基低级烷基或
苯基低级烷
氧基,所述低级烷基可被羧基、低级烷
氧基羰基、
氨基、低级烷基
氨基、低级烷
氧基羰基
氨基或
苯基低级烷基
氨基取代,所述
苯基低级烷基、
苯基低级烷
氧基或
苯基低级烷基
氨基的
苯基环可被低级烷基、低级烷
氧基、卤素、羧基或低级烷
氧基羰基取代;
A 是直链或支链低级亚烷基、
n 为 0 或 1。这种化合物可用于治疗由免疫紊乱引起的各种疾病,如免疫缺陷和自身免疫性疾病。