Regioselectivity in the Aryne Cross-Coupling of Aryllithiums with Functionalized 1,2-Dibromobenzenes
作者:Vincent Diemer、Manon Begaud、Frédéric R. Leroux、Françoise Colobert
DOI:10.1002/ejoc.201001283
日期:2011.1
Tri- and tetrasubstituted ortho-bromobiaryls have been synthesized in good-to-excellent yields by arynecross-coupling reactions starting from 1,3-dimethoxybenzene and functionalized1,2-dibromobenzenes. This study outlines the influence of the 1,2-dibromobenzene precursor as well as the reaction temperature on the outcome of the aryl-aryl bond formation and indicates, in the case of dissymmetrical
Enantioselective Synthesis of Atropisomeric Biaryls using Biaryl 2,5‐Diphenylphospholanes as Ligands for Palladium‐Catalysed Suzuki‐Miyaura Reactions
作者:Liam Byrne、Christian Sköld、Per‐Ola Norrby、Rachel H. Munday、Andrew R. Turner、Peter D. Smith
DOI:10.1002/adsc.202001211
日期:2021.1.5
describe the development of biaryl2,5‐diphenylphospholanes as a new class of C2‐symmetric, monodentate ligands for asymmetric Suzuki‐Miyaura (ASM) reactions. Screening of a series of exemplary phospholanes led to the identification of two ligands that were used to prepare a range of atropisomericbiaryl and heterobiaryl products with good to excellent levels of enantioselectivity (up to 97:3 e.r.) under