Enantioselective Organocopper-Catalyzed Hetero Diels–Alder Reaction through <i>in Situ</i> Oxidation of Ethers into Enol Ethers
作者:Ahmet Yesilcimen、Na-Chuan Jiang、Felix H. Gottlieb、Masayuki Wasa
DOI:10.1021/jacs.2c01656
日期:2022.4.13
We demonstrate that a chiral Cu–BOX complex catalyzes the efficient oxidation of ethers into enol ethers in the presence of trityl acetate. Then, the organocopper promotes stereoselective hetero Diels–Alder reaction between the in situ generated enol ethers and β,γ-unsaturated ketoesters, allowing for rapid access to an array of dihydropyran derivatives possessing three vicinal stereogenic centers.
我们公开了一种用于烷基醚和杂二烯的对映和非对映选择性结合的催化方法。我们证明了手性 Cu-BOX 配合物在乙酸三苯甲基酯存在下催化醚有效氧化成烯醇醚。然后,有机铜促进原位生成的烯醇醚和 β,γ-不饱和酮酯之间的立体选择性异 Diels-Alder 反应,从而可以快速获得一系列具有三个邻位立体中心的二氢吡喃衍生物。