synthesized from the corresponding fluorinated 3-hydroxybenzaldehydes. New routes to 2-fluoro- and 6-fluoro-3-hydroxybenzaldehydes were developed based on regioselective lithiation of 2- and 4-[(dimethyl-tert-butylsilyl)oxy]fluorobenzene ortho to fluorine. As with norepinephrine and isoproterenol analogues, the adrenergic properties of phenylephrine were markedly altered by ring fluorination. The order of potency
由相应的
氟化3-羟基
苯甲醛合成2-
氟-,4-
氟-和
6-氟苯肾上腺素(6-FPE)。基于2-和4-[(二甲基-叔丁基甲
硅烷基)氧基]
氟苯邻位到
氟的区域选择性
锂化,开发了2-
氟-和6-
氟-3-羟基
苯甲醛的新路线。与
去甲肾上腺素和
异丙肾上腺素类似物一样,苯
肾上腺素的
肾上腺素能通过环
氟化显着改变。
氟类似物作为α1-
肾上腺素能激动剂在刺激主动脉条收缩和
磷脂酰肌醇代谢以及在豚鼠突触小体中循环
AMP积累增强的效力顺序为:6-FPE大于PE大于4-FPE大于2-FPE。对于脑膜上的α1和α2
肾上腺素能受体特异性放射性
配体的置换,观察到相同的模式。从大脑膜上置换[3H] dihydroalprenolol(一种β特异性
肾上腺素配体)的效能顺序为:2-FPE大于4-FPE = PE大于6-FPE。与β-受体相比,6-FPE对α-
肾上腺素受体的选择性要比
去氧肾上腺素高得多。基于由于
氟和苄基羟基的静电排斥而引起的