Optically active catecholimidazolines: a study of steric interactions at .alpha.-adrenoreceptors
摘要:
The optical isomers and deoxy form of 2-(3,4, alpha-trihydroxybenzyl)imidazoline hydrochloride were examined for their alpha-adrenergic activity on rat aorta. The rank order of stimulant activity was deoxy (2) congruent to (R)-(-)-1 greater than (S)-(+)-1. This is in contrast to catecholamines in which the order of activity is (R)-(-)-epinephrine greater than (S)-(+)-epinephrine = epinine (deoxyepinephrine). The relative order of potency for the isomers of 2-(3,4, alpha-trihydroxybenzyl)imidazoline is different than that predicted by the Easson--Stedman theory for stereoisomers of catecholamines. Also, substitution of the deoxy compound 2 with substituents, methyl or benzyl, in the 4-position lowers the alpha-adrenergic agonist activity, and differences observed between optical isomers were small.
Optically active catecholimidazolines: a study of steric interactions at .alpha.-adrenoreceptors
作者:Duane D. Miller、Akihiko Hamada、Edward C. Craig、Gary G. Christoph、Judith C. Galluci、Peter J. Rice、Jon W. Banning、Popat N. Patil
DOI:10.1021/jm00361a005
日期:1983.7
The optical isomers and deoxy form of 2-(3,4, alpha-trihydroxybenzyl)imidazoline hydrochloride were examined for their alpha-adrenergic activity on rat aorta. The rank order of stimulant activity was deoxy (2) congruent to (R)-(-)-1 greater than (S)-(+)-1. This is in contrast to catecholamines in which the order of activity is (R)-(-)-epinephrine greater than (S)-(+)-epinephrine = epinine (deoxyepinephrine). The relative order of potency for the isomers of 2-(3,4, alpha-trihydroxybenzyl)imidazoline is different than that predicted by the Easson--Stedman theory for stereoisomers of catecholamines. Also, substitution of the deoxy compound 2 with substituents, methyl or benzyl, in the 4-position lowers the alpha-adrenergic agonist activity, and differences observed between optical isomers were small.