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).
The present invention provides compounds of general formula (I) ##STR1## wherein Ar represents an unsubstituted or substituted phenyl gorup; R.sup.1 and R.sup.2 each represents a hydrogen atom or a C.sub.1-3 alkyl group; X represents a bond or a C.sub.1-7 alkylene, C.sub.2-7 alkenylene or C.sub.2-7 alkynylene chain; Y represents a bond or a C.sub.1-6 alkylene, C.sub.2-6 alkenylene or C.sub.2-6 alkynylene chain; Q represents a substituted phenyl or pyridyl ring; and physiologically acceptable salts and solvates thereof useful as stimulants of .sub.2 -adrenoreceptors and particularly in the treatment of diseases associated with reversible airways obstruction such as asthma and chronic bronchitis.
Intermediates for preparing pirbuterol and analogs
申请人:Pfizer Inc.
公开号:US04632992A1
公开(公告)日:1986-12-30
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).