Process Research and Development of an NK-1 Receptor Antagonist. Enantioselective Trifluoromethyl Addition to a Ketone in the Preparation of a Chiral Isochroman
作者:Stéphane Caron、Nga M. Do、Janice E. Sieser、Patrice Arpin、Enrique Vazquez
DOI:10.1021/op7001886
日期:2007.11.1
CJ-17,493 (4) is a chiral NK-1 receptor antagonist. It was first prepared through a diastereoselective crystallization, then through chiral chromatography of a key intermediate, and ultimately via asymmetricsynthesis. Multiple routes for the preparation of a key isochroman were demonstrated, and conditions for improved regioselectivity of a Friedel–Crafts acylation were identified. Cesium fluoride