title: Rhodium-catalyzed oxidative annulation of sulfoximines and alkynes as an approach to 1,2-benzothiazines.
abstract: Revitalization by oxygen: A rhodium(III)-catalyzed oxidative CH/NH activation/annulation sequence provided access to a variety of substituted 1,2-benzothiazine derivatives from readily available NH-sulfoximines and alkynes (see scheme; Cp*=C5 Me5 ). The oxidation system consisted of molecular oxygen in combination with a catalytic amount of Fe(OAc)2 .
authors.affiliation: Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen (Germany).
authors.forename: Wanrong
authors.initials: W
authors.lastname: Dong
authors.forename: Long
authors.initials: L
authors.lastname: Wang
authors.forename: Kanniyappan
authors.initials: K
authors.lastname: Parthasarathy
authors.forename: Fangfang
authors.initials: F
authors.lastname: Pan
authors.forename: Carsten
authors.initials: C
authors.lastname: Bolm
keywords: 1,2-benzothiazines; CH activation; alkynes; annulation; sulfoximines