AN EFFICIENT AND STEREOSELECTIVE PROCESS FOR LARGE SCALE SYNTHESIS OF 3-(R)-3- (2,3-DIHYDROBENZOFURAN-5-YL)-1,2,3,4- TETRAHYDROPYRROLO{3,4-B}QUINOLIN-9-ONE

摘要

This invention relates to an efficient process for large scale stereoselective production of (3R)-3-(2,3-dihydrobenzofuran-5-yl)-1,2,3,4-tetrahydropyrrolo{3,4-b}quinolin-9-ones and key intermediates used for the preparation of benzofuranyl pyrroloquinolones as potent and selective PDE5 inhibitors for the treatment of erectile dysfunction, as well as pharmaceutical compositions and methods of treatment utilizing these compounds.