PROCESS FOR THE PREPARATION OF CYSTEINE DERIVATIVES OF INTRA OR INTERMOLECULAR DISULFIDE

摘要

Intra-or Inter-molecular disulphides of cysteine derivs. of formula (I) are new. In (I) R1 and R2 are H, lower alkyl, aryl, aralkyl, lower alkanoyl or aroyl; A is opt. branched C1-3 alkylene, esp. -(CH3)2-. They are made e.g. by reacting HS.A.COOH with the appropriate alpha-amino acid deriv. (I) and their salts are useful for treating liver diseases, rheumatism, cataracts and diseases caused by disturbances of the natural immune system. They have excellent stability.