作者:William P. Malachowski、Tapas Paul、Sophia Phounsavath
DOI:10.1021/jo070976v
日期:2007.8.31
arylic quaternary stereocenter of (−)-lycoramine with excellent enantioselective control. The product of the Birch−Cope sequence, a versatile 4,4-disubstituted-2-carboxamide-2-cyclohexen-1-one, was elaborated through an intramolecular conjugate addition of a phenol to create the dihydrofuran ring. Chemoselective elaboration of the allyl group into an amide followed by a modified Pictet-Spengler reaction
(-)-lycoramine的第一个对映选择性合成已从联芳基衍生物1分14步完成,总收率达5%。该合成应用先前开发的Birch-Cope序列,以优异的对映选择性控制来创建(-)-lycoramine的关键芳基四元立体中心。Birch-Cope序列的产物,一种通用的4,4-二取代-2-羧酰胺-2-环己烯-1-酮,通过分子内共轭添加苯酚来制成二氢呋喃环。将烯丙基化学选择性修饰成酰胺,然后进行修饰的Pictet-Spengler反应,生成了氮杂ring环。