Abstract

The synthesis of a series of azabicyclic indole esters is described and their potency reported as 5-HT 4 receptor antagonists. Optimization of the most potent compound ( 19) by preparing the corresponding oxazino[3,2- a]indole ester afforded 34, which had a pIC 50 of 9.5 in the guinea pig distal colon longitudinal muscle myenteric plexus preparation.

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