A [2-hydroxy-3-(4-phenylpiperazinyl)propoxy]benzofuran derivative having the formula (I): ##STR1## wherein X is acetyl, carbamoyl, cyano, a lower alkoxycarbonyl, carboxyl or 1-hydroxyethyl group, R is hydrogen atom, a lower alkoxy group, a lower alkyl group or a halogen atom; R is attached to an arbitrary position of ortho-position, meta-position and para-position to N-phenyl group, and a group having the formula: ##STR2## is attached to an arbitrary position of 4, 5, 6 and 7 positions to benzofuran ring or the salt thereof, a process for preparing the same and an antihypertensive agent containing the same as an effective component. The benzofuran derivative has a strong .alpha.-adrenergic blockade effect and calcium antagonistic effect with a more decreased side-effect.
                            具有以下结构式(I)的一种
苯并呋喃衍
生物:其中X为乙酰基、
氨基甲酰基、
氰基、较低的烷氧羰基、羧基或1-羟乙基基团,R为氢原子、较低的烷氧基团、较低的烷基团或卤原子;R连接到N-苯基的邻位、间位和对位的任意位置,以及连接到
苯并呋喃环的4、5、6和7位的任意位置或其盐的结构式:制备该化合物的方法以及含有该化合物作为有效成分的降压药。该
苯并呋喃衍
生物具有强烈的α-
肾上腺素受体阻滞作用和
钙拮抗作用,副作用减少。