Some new sulfur macrocyclic diamides and tetraamides were obtained via a simple and convenient method. This method consists of reacting a dicarboxylic acid dichloride with the appropriate diamine in dichloromethane. The cyclization does not require high dilution technique or template effect and the expected dilactams were obtained in high yields.
sulfur macrocyclic diamides - diamine - dicarboxylic acid dichloride