title: Iodocyclization of o-alkynylbenzamides revisited: formation of isobenzofuran-1(3H)-imines and 1H-isochromen-1-imines instead of lactams.
abstract: The iodocyclization of o-alkynylbenzamides with various electrophiles has been reported to yield five- or six-membered lactams by nucleophilic attack of the amide nitrogen onto the triple bond. While the formation of an isobenzofuran-1(3H)-imine with two bulky substituents under Larock conditions was initially attributed to steric hindrance, we found out that cyclization via the amide oxygen is the rule rather than the exception. Thus, the structures of the products reported in the literature need to be revised.
authors.affiliation: Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
authors.forename: Claudine
authors.initials: C
authors.lastname: Schlemmer
authors.forename: Lars
authors.initials: L
authors.lastname: Andernach
authors.forename: Dieter
authors.initials: D
authors.lastname: Schollmeyer
authors.forename: Bernd F
authors.initials: BF
authors.lastname: Straub
authors.forename: Till
authors.initials: T
authors.lastname: Opatz