Synthesis and α-adrenoceptor blocking activity of the enantiomers of benzyl-(2-chloroethyl)-[2-(2-methoxyphenoxy)-1-methylethl]amine hydrochloride
摘要:
The enantiomers of benzyl-(2-chloroethyl)-[2-(2-methoxyphenoxy)-1-methylethyl]amine hydrochloride (1, CM18) were synthesized and studied pharmacologically for their irreversible antagonism at rat vas deferens alpha-adrenoceptors. In addition, assignment of the absolute configuration of the two enantiomers of 1 was made by X-ray crystallographic analysis performed on the intermediate amine (+)-2 hydrochloride. The enantiomer (R)-(+)-1 [(R)-(+)-CM18] (a) had a 10-fold preferential blocking activity for alpha(1)- versus alpha(2)-adrenoceptors, (b) discriminated, like racemic 1, between two possible alpha(1)-adrenoceptor subsites/subtypes, with a selectivity ratio of 6.5 and (c) was 10-23 times as potent as the (S)-(-)-enantiomer at alpha(2)- and alpha(1)-adrenoceptors. Thus, it maybe a valuable tool for the characterization of rat vas deferens alpha(1)-adrenoceptor subtypes. (C) 1997 Elsevier Science Ltd.