Synthesis of 2-carbalkoxyamino-5(6)-(1-substituted piperazin-4-yl/piperazin-4-ylcarbonyl)benzimidazoles and related compounds as potential anthelmintics.

A number of 1,4-di-(3,4-disubstituted benzoyl)piperazines (3-6), 1-(3,4-disubstituted benzoyl)-4-(3,4-disubstituted phenyl)piperazines (9-11), 1,4-di-(2-carbalkoxyaminobenzimidazol-5(6)-yl-carbonyl)piperazines (12, 13), 1-(2-carbalkoxyaminobenzimidazol-5(6)- ylcarbonyl)-4-(2-carbalkoxyaminobenzimidazol-5(6)-yl) piperazines (14, 15) and 1-(2-carbalkoxyaminobenzimidazol-5(6)-yl)-4-(N,N- dicarbalkoxyamidino)piperazines (17, 18) have been synthesized and their anthelmintic activity is reported.