Access to Tetrahydrothiopyrano[2,3‐<i>b</i>]Indole Derivatives via Zinc‐Catalyzed Asymmetric [3+3] Annulation of Indoline‐2‐Thiones with Yne–Enones
作者:Dan‐Dan Cui、Jian‐Wen Shi、Tong Wang、Yuan‐Zhao Hua、Min‐Can Wang、Guang‐Jian Mei、Jun‐Long Niu、Shi‐Kun Jia
DOI:10.1002/adsc.202400072
日期:2024.4.23
We report herein an enantioselective [3 + 3] annulation of indoline‐2‐thiones with yne−enones by chiral dinuclear zinc catalysts via a Brønsted base and Lewis acid cooperative activation. This transformation proceeded through sequential conjugate addition, allenyl ketone formation and intramolecular sulfa‐Michael 6‐endo‐trig cyclization. A range of enantioenriched tetrahydrothiopyrano[2,3‐b]indole
我们在此报告了通过手性双核锌催化剂通过布朗斯台德碱和路易斯酸协同活化,二氢吲哚-2-硫酮与炔烯酮的对映选择性[3 + 3]环化。这种转化通过顺序共轭加成、丙二烯基酮形成和分子内磺胺-Michael 6-endo-trig环化进行。以中等产率获得了一系列带有环外双键的对映体富集四氢吡喃并[2,3-b]吲哚衍生物,具有优异的立体选择性(高达 20:1 dr、20:1 Z/E 比和 95% ee)。还探索了后期功能化、大规模实验和进一步衍生化。