Several dihydro and carbocyclic analogues of tryptamine were evaluated in order to determine the role of the heterocyclic portion of the indole nucleus on the interaction of indolealkylamines with the serotonin receptors of the rat fundus. Reduction of the C2-C3 double bond or replacement of the indole nitrogen with an sp3-hybridized carbon atom results in a 50% decrease in receptor affinity. Complete removal of the five-membered ring ...
