A concise method for the asymmetric synthesis of tricyclic chromans from salicylaldehydes and cyclic ketones was developed through bifunctional enamine-metal Lewis acid catalysis. Mechanism of the chroman formation reaction was proposed and investigated with deuterium experiments and DFT calculations. Tricyclic chromans containing three consecutive stereogenic centers were prepared in good yields (up
通过双功能烯胺-
金属
路易斯酸催化,开发了一种从
水杨醛和环酮不对称合成
三环色满的简明方法。提出并通过
氘实验和DFT计算研究了色满形成反应的机理。以良好的产率(高达 87%)和立体选择性(高达 99% ee 和 11 : 1 : 1 dr)制备了包含三个连续立体中心的
三环色满。