Directed Ortho Metalation Methodology. The <i>N</i>,<i>N</i>-Dialkyl Aryl <i>O</i>-Sulfamate as a New Directed Metalation Group and Cross-Coupling Partner for Grignard Reagents
作者:Todd K. Macklin、Victor Snieckus
DOI:10.1021/ol050393c
日期:2005.6.1
with a variety of electrophiles constitutes a new generalroute 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)
CH Activation by Amide Chelation Control: Ruthenium‐ Catalyzed Direct Synthesis of 2‐Aryl‐3‐furanamides
作者:Yigang Zhao、Victor Snieckus
DOI:10.1002/adsc.201400147
日期:2014.5.5
methodology for the synthesis of heterobiaryls by the ruthenium‐catalyzedCH activation/cross‐coupling of heterocyclic amides with aryl boroneopentylates is surveyed. From this survey, the highly regioselective reaction of furan‐3‐carboxamide to give 2‐aryl‐3‐furanamides is optimized and generalized in scope with respect to the aryl boroneopentylate coupling partners. Established thereby is a one‐step synthetic
Disclosed is a new, catalytic, and general methodology for the chemical synthesis of biaryl, heterobiaryl, and polyaryl molecules by the cross-coupling of o-methoxybenzamides with aryl boroneopentylates. The reaction is based on the activation of the unreactive C-OMe bond by the proximate amide directing group using catalytic RuH2(CO)(PPh3)3 conditions. A one-step, base-free coupling process is thereby
Beyond Directed <i>Ortho</i> Metalation: Ruthenium-Catalyzed Amide-Directed C<sub>Ar</sub>–N Activation/C–C Coupling Reaction of Anthranilamides with Organoboronates
作者:Yigang Zhao、Victor Snieckus
DOI:10.1021/ol501180q
日期:2014.6.20
A new, catalytic, and general methodology for the synthesis of biaryls and heterobiaryls by the cross coupling of anthranilamide derivatives (o-NMe2 benzamides) with aryl boroneopentylates is described. The reaction proceeds under catalytic RuH2(CO)(PPh3)3 conditions driven by the activation of the unreactive C–N bond by amide directing group (DG)-Ru catalyst chelation. High regioselectivity, orthogonality
Beyond Directed <i>ortho</i> Metalation: Ruthenium-Catalyzed Amide-Directed C<sub>Ar</sub>–OMe Activation/Cross-Coupling Reaction of Naphthamides with Aryl Boronates
作者:Yigang Zhao、Victor Snieckus
DOI:10.1021/acs.orglett.5b01913
日期:2015.10.2
A new and general synthetic methodology for the construction of biaryl, heterobiaryl, and polyaryl molecules by the ruthenium-catalyzed cross-coupling of ortho-methoxy naphthamides with aryl boroneopentylates is described. The isomeric 1-MeO-2-naphthamides and 2-MeO-1-naphthamides furnish an expansive series of arylated naphthamides in excellent yields. Competition experiments showed the higher reactivity