S. Caron, Nga M. Do, J. Sieser
Oct 30, 2007
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Influential Citations
56
Citations
Journal
Organic Process Research & Development
Abstract
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 asymmetric synthesis. 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 was found to be an acceptable initiator for the generation of a nucleophilic trifluoromethyl anion from CF3TMS. A cinchonine-derived catalyst was identified for the enantioselective addition of the trifluoromethyl group to the ketone, and it was found that the product of the addition would be converted directly to the isochroman by treatment with t-BuOK. A Duff reaction was used for the formylation, and the resulting aldehyde was coupled to amine 5 to afford CJ-17,493 (4).