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 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
CJ-17493(4)是手性NK-1受体拮抗剂。首先通过非对映选择性结晶,然后通过关键中间体的手性色谱法制备,最后通过不对称合成制备。展示了制备关键异色满的多种途径,并确定了改善Friedel-Crafts酰化反应的区域选择性的条件。发现氟化铯是从CF 3 TMS生成亲核三氟甲基阴离子的可接受引发剂。对于三氟甲基向酮的对映选择性加成,发现了新奇宁碱衍生的催化剂,并且发现加成产物将通过用t处理而直接转化为异色满。-买 使用达夫(Duff)反应进行甲酰化,并将生成的醛与胺5偶联,得到CJ-17,493(4)。