Compounds of the formula (I):
in which:
X and Y are independently hydrogen, hydroxy, lower alkyl, lower alkoxy or halo, or X and Y taken together is methylenedioxy or ethylene-1,2-dioxy, and
R is lower alkyl, optionally substituted phenyl, -(CH₂)mOR¹ or -NR¹R², wherein m is an integer of 1 to 6 and R¹ and R² are independently hydrogen or lower alkyl, or the group -NR¹R² forms a heterocycle of the formula:
wherein A is -CH₂-, -NR¹- or oxygen, wherein R¹ has the above meaning and the wavy lines indicate that the hydrogen atom attached thereto is in either the α- or β-position; or a pharmaceutically acceptable salt thereof, are useful as selective α₂-blockers.
式(I)化合物:
其中
X 和 Y 独立地为氢、羟基、低级烷基、低级烷氧基或卤素,或 X 和 Y 合在一起为亚甲基二氧基或
乙烯-1,2-二氧基,以及
R 是低级烷基、任选取代的苯基、-(CH₂)mOR¹ 或 -NR¹R²,其中 m 是 1 至 6 的整数,R¹ 和 R² 独立地为氢或低级烷基,或基团 -NR¹R² 形成式中的杂环:
其中 A 是-CH₂-、-NR¹- 或氧,其中 R¹ 具有上述含义,波浪线表示连接其上的氢原子位于 α- 或 β-位;或其药学上可接受的盐,可用作选择性 α₂ 受体阻滞剂。