Correlation between affinity toward adrenergic receptors and approximate electrostatic potentials of phenylethylamine derivatives. 1. Effects of the side chain

Abstract
The molecular electrostatic potential (VN) in the region of the N lone pair of a series of substituted propylamines is used in a correlation with the dissociation constants of parent phenylethylamine-type ligands obtained on .beta.-adrenoceptors. VN is a more effective index for quantitative structure-activity relationship studies than an optimal set of substituent constants used in additive, linear models. No significant correlation between the total electronic change on the N and the binding potencies was obtained in the examined series. Protonation energies of the propylamines were computed, but no meaningful correlation with the dissociation constants was obtained.