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This paper describes the synthesis and blocking activities of twelve new isoindolinone- and isobenzofuranone-containing phenoxylalkylamines as potent α(1)-Adrenoceptor antagonists. These compounds were synthesized in moderate to good yields starting from 3,4-dimethylphenol, and characterized with (1)H-NMR, MS, IR and elemental analysis. Their blocking activities toward α(1)-Adrenoceptors were evaluated on isolated rat anococcygeus muscles. The results indicated that these compounds were very strong in blocking α(1)-Adrenoceptors, and most of them exhibited activities that were comparable to that of known potent α(1)-Adrenoceptor antagonist 1-(2,6-dimethylphenoxy)-2-(3,4-dimethoxyphenylethylamino)propane hydrochloride (DDPH).

Synthesis and Blocking Activities of Isoindolinone- and Isobenzofuranone-Containing Phenoxylalkylamines as Potent .ALPHA.1-Adrenoceptor Antagonists