Processes and intermediates useful in the preparation of bronchodilator compounds of the formula ##STR1## wherein R is hydrogen, methyl or hydroxymethyl are described. Those compounds wherein R is H or CH.sub.3 have been found to have further utility as intermediates for pirbuterol (wherein R is hydroxymethyl).
本文描述了制备支气管扩张剂化合物的过程和中间体,其
化学式为##STR1##其中R为氢、甲基或羟甲基。发现当R为H或CH.sub.3时,这些化合物还可作为哌布特罗(其中R为羟甲基)的中间体。