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,该化合物的
化学式为##
STR1##其中R为
氢、
甲基或
羟甲基。已经发现当R为H或CH.sub.3时,这些化合物具有进一步用作哌布特罗(其中R为
羟甲基)
中间体的效用。