A compound of the formula [I] and pharmaceutically acceptable salts thereof; and a synthetic intermediate represented by the fomula [II] and pharmaceutically acceptable salts thereof,
wherein
R 1 is hydrogen or lower alkyl;
R 2 is hydrogen or a protective group of thiol;
R 3 is hydroxy, a remainder of ester group or a remainder of amido group;
A is straight or branched lower alkylene, and
the sulfur atom in the side chain may be directly join with -CO- to conform a thiolactone ring.
The compounds of this invention have excellent thymulin-like activities and are expected to be useful for treatment of various immune disorders such as immunodeficiency and autoimmune diseases.
式 [I] 代表的化合物及其药学上可接受的盐;以及式 [II] 代表的合成中间体及其药学上可接受的盐、
其中
R 1 是氢或低级烷基
R 2 是氢或
硫醇保护基团
R 3 是羟基、酯基的余量或
氨基的余量;
A 是直链或支链低级亚烷基,以及
侧链中的
硫原子可直接与-CO-连接,形成一个
硫内酯环。
本发明的化合物具有优异的
胸腺素样活性,有望用于治疗各种免疫性疾病,如免疫缺陷和自身免疫性疾病。