The (R,R)-, (S,S)-, (R,S)-, (R,S)- isomers of 3-amino-4-hydroxy-.alpha.-[[[2-(4-methoxyphenyl)-1-methylethyl]amino]methy l]-benzenemethanol (D) ##STR1## are disclosed, as well as an efficient method for their stereoselective synthesis. A method and composition are also disclosed utilizing desformoterol (D) as a bronchodilator, having high selectivity for .beta..sub.2 receptors.
3-
氨基-
4-羟基-α-[[[2-(4-
甲氧基苯基)-1-甲基乙基]
氨基]甲基]-
苯甲醇 (D)的(R,R)-、(S,S)-、(R,S)-、(R,S)-异构体被揭示,以及一种高立体选择性合成它们的有效方法。还揭示了一种使用D作为β2受体高选择性支气管扩张剂的方法和组合物。