Gold‐Catalyzed Dual Annulation of Homopropargyl Alcohols with Nitrones: Synthesis of Tetrahydropyrano[4,3‐
<i>b</i>
]indole Scaffolds
作者:Hanlin Wei、Su Zhou、Lihua Qiu、Yu Qian、Wenhao Hu、Xinfang Xu
DOI:10.1002/adsc.201900426
日期:2019.8.5
An unprecedented gold‐catalyzed dual annulation of homopropargyl alcohols with nitrones has been developed, which provides an effective access to the 1,3,4,5‐tetrahydropyrano[4,3‐b]indole derivatives in good to high yields. Mechanistically, this one‐pot three‐step cascade reaction is initiated by a gold‐catalyzed alkyne oxoarylation, followed by an intramolecular cyclodehydration and terminated with
与硝酮高炔丙基醇的前所未有的金催化的双环已被开发,这提供了有效的访问-1,3,4,5-四氢吡喃并[4,3- b ]吲哚衍生物以良好至高产率。从机理上讲,这种一锅三步的级联反应是由金催化的炔基羰基化反应引发的,然后进行分子内环脱水反应,并终止于醛间的分子间环化反应,而醛是该级联反应过程的早期残留物。