title: Directed ortho metalation methodology. The N,N-dialkyl aryl O-sulfamate as a new directed metalation group and cross-coupling partner for Grignard reagents.
abstract: [reaction: see text] The ortho metalation (RLi/THF/-93 degrees C) of 3 followed by quench with a variety of electrophiles constitutes a new general route to substituted aryl O-sulfamates 4a-k. The Kumada-Corriu cross-coupling of O-sulfamates 4e, 4n-s, and 6a with Grignard reagents gives biaryls 9a-m, and the use of 2-halo and boron derivatives 4h, 4i, and 4k for Suzuki-Miyaura cross-coupling and generation of benzynes leads to naphthols 7a and 7b. A relative metalation ranking of the OSONEt(2) is reported.
authors.affiliation: Department of Chemistry, Queen's University, Kingston, ON, K7L 3N6, Canada.
authors.forename: Todd K
authors.initials: TK
authors.lastname: Macklin
authors.forename: Victor
authors.initials: V
authors.lastname: Snieckus