Directed ortho-metalation and Suzuki–Miyaura cross-coupling connections: regiospecific synthesis of all isomeric chlorodihydroxybiphenyls for microbial degradation studies of PCBs
A transition-metal-free direct oxidative trifluoromethylation of unsymmetrical biaryls has been achieved by the simple combination of trifluoromethanesulfinate and phenyliodine bis(trifluoroacetate). The trifluoromethylation is selectively observed in the electron-rich arenes.
Combined Directed <b><i>ortho</i></b> Metalation/Suzuki−Miyaura Cross-Coupling Strategies. Regiospecific Synthesis of Chlorodihydroxybiphenyls and Polychlorinated Biphenyls
作者:S. Nerdinger、C. Kendall、X. Cai、R. Marchart、P. Riebel、M. R. Johnson、C.-F. Yin、N. Hénaff,、L. D. Eltis、V. Snieckus
DOI:10.1021/jo062543i
日期:2007.8.1
The Directed ortho Metalation (DoM)/Suzuki-Miyaura cross-coupling strategy is applied for the regiospecific construction of all isomeric monochloro and selected dichloro and trichloro 2,3-dihydroxybiphenyls (DHBs). The combined methodology highlights iterative DoM processes, hindered Suzuki-Miyaura couplings, and advantages in diversity in approaches from commercial starting materials leading to provision of chloro-DHBs as single isomers in high purity and on a gram scale. The syntheis of several PCBs are also reported.
Directed ortho-metalation and Suzuki–Miyaura cross-coupling connections: regiospecific synthesis of all isomeric chlorodihydroxybiphenyls for microbial degradation studies of PCBs
作者:S. Nerdinger、R. Marchhart、P. Riebel、C. Kendall、M. R. Johnson、C.-F. Yin、V. Snieckus、L. D. Eltis
DOI:10.1039/a907279i
日期:——
Monochloro DHBs 1aâd and 2aâc have been regioselectively synthesised in good overall yields by a combination of directed ortho metalation and SuzukiâMiyaura cross-coupling.
A New Strategy for the Synthesis of Polychlorinated Biphenyl Metabolites
作者:Udo Bauer、Anthony R. Amaro、Larry W. Robertson
DOI:10.1021/tx00043a012
日期:1995.1
A general and high-yielding synthetic route is presented by which a variety of chlorinated dihydroxybiphenyl metabolites may be synthesized. These synthetic standards will permit the investigation of novel pathways of polychlorinated biphenyl activation. The biphenyldiols were synthesized via palladium-catalyzed cross-coupling of dimethoxyphenylboronic acids with aryl bromides in the presence of a