Enantioselective construction of dihydropyranone-fused indoles by [3 + 3] annulation of <i>in situ</i>-derived indolin-3-ones and unsaturated carboxylic esters
Hongling Wang, Qiangqiang Zhang, Xiao Shuai, Guanjie Wang, Xuan Huang, Xingkuan Chen, Junmin Zhang
Abstract
This work discloses an N-heterocyclic carbene (NHC) and base-mediated [3 + 3] annulation reaction of unsaturated carboxylic esters and sulfonium salts for rapid and direct access to enantioselective dihydropyrano[3,2- b ]indoles.
Topics & Concepts
AnnulationChemistrySulfoniumEnantioselective synthesisCarbeneOrganic chemistryIn situIndole testCatalysisCombinatorial chemistrySalt (chemistry)N-Heterocyclic Carbenes in Organic and Inorganic ChemistryCatalytic Cross-Coupling ReactionsSynthetic Organic Chemistry Methods