Synthesis and antihypertensive activity of 2-benzamido-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizines

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Abstract
The synthesis and antihypertensive activity of a series of 2-benzamido-1,2,3,4,6,7,12,12b-oxtahydroindolo[2,3-.alpha.]-quinolizines are reported. These compounds exhibit extremely potent hypotensive properties (e.g., N-methylbenzamides 42, 48 and 50 and N-ethylbenzamide 53 cause drops of 110, 103, 79, and 83 mmHg, respectively, in systolic blood pressure in the spontaneous hypertensive rat at the screening dose of 50 mg/kg orally). Structure-activity relationships for the entire series are discussed.

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