Desformoterol and process for its preparation

摘要

The (R,R)-, (S,S)-, (R,S)-, (R,S)- isomers of 3-amino-4-hydroxy- alpha -[[[2-(4-methoxyphenyl)-1-methylethyl]amino]methyl]-benzenemethanol (D) 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 2 receptors.