Studies on cardiotonic agents. III. Synthesis of 1-(1-(6,7-dimethoxy-4-quinazolinyl)-4-piperidinyl)-3-substituted 2-imidazolidinone and 2-imidazolidinethione derivatives.
A series of 1-[1-(6,7-dimethoxy-4-quinazolinyl)-4-piperidinyl]-3-substituted 2-imidazolidinone and 2-imidazolidinethione derivatives was synthesized and examined for cardiotonic activity in anesthetized dogs. Alkylation of the 2-imidazolidinone (1) afforded the N-alkylated products, while alkylation of the 2-imidazolidinethione (12) afforded the S-alkylated derivatives accompanied with a small quantity