title: An unprecedented benzannulation of oxindoles with enalcarbenoids: a regioselective approach to functionalized carbazoles.
abstract: A novel Rh(ii)/Brønsted acid catalyzed tandem benzannulation of oxindoles with enaldiazo carbonyls led to the formation of valuable 1-hydroxy-2-acylcarbazoles. This reaction is proposed to involve a formal insertion of a rhodium enalcarbenoid into an oxindole sp(2) C-O bond, an oxa-Michael addition, Friedel-Crafts reaction and a semipinacol type 1,2-carbonyl migration.
authors.affiliation: Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh 462066, India. sk@iiserb.ac.in.
authors.forename: Kuldeep Singh
authors.initials: KS
authors.lastname: Rathore
authors.forename: Bapurao Sudam
authors.initials: BS
authors.lastname: Lad
authors.forename: Haribabu
authors.initials: H
authors.lastname: Chennamsetti
authors.forename: Sreenivas
authors.initials: S
authors.lastname: Katukojvala