An enantioselective Mannich‐type reaction of 3‐butynol and nitrones is described, which affords dihydrofuran‐3‐ones in good yields and with excellent enantioselectivities. The reaction is initiated by gold‐catalyzed alkyne oxidation and modification of the resulting gold carbene species with a tethered hydroxy group to form enolate species; the reaction terminates with an enantioselective Mannich‐type
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。