Catalytic Palladium Phosphination: Modular Synthesis of C1-Symmetric Biaryl-Based Diphosphines
作者:Laurence Bonnafoux、Rafael Gramage-Doria、Françoise Colobert、Frédéric R. Leroux
DOI:10.1002/chem.201101529
日期:2011.9.19
derivative. So far, no synthetic pathway has been found to avoid this intramolecular reaction. Herein we report the first general and external‐ligand‐free palladium‐catalyzed phosphination reaction that allows the synthesis of a wide variety of substituted ortho,ortho′‐bis(diphenylphosphino)biphenyls. With the aim of illustrating the scope and efficiency of this methodology, we applied it to the establishment
Process for the preparation of asymmetrically substituted biaryldiphosphines
申请人:Lonza AG
公开号:EP1609795A1
公开(公告)日:2005-12-28
Provided is a process for the preparation of asymmetrically substituted biaryldiphosphine ligands of the formula
wherein R1 is C1-6-alkyl or C3-10-cycloalkyl optionally being substituted with one or more halogen atoms, and
R2 and R3 are independently selected from the group consisting of aryl, C5-10-cycloalkyl and C1-6-alkyl, wherein each aryl moiety is optionally substituted with one or more substituents selected from the group consisting of halogen atoms, nitro, amino, C1-6-alkyl, C1-6-alkoxy and di-C1-6-alkylamino groups, and each C1-6-alkyl, C1-6-alkoxy, di-C1-6-alkylamino and C5-10-cycloalkyl group in R2 and R3 optionally being substituted with one or more halogen atoms, from 2,2',6,6'-tetrabromobiphenyl by a sequence of halogen-metal exchanges and subsequent reactions.
First Modular Synthesis of Dissymmetric Biaryldiphosphine Ligands Allowing Tunable Steric and Electronic Effects
作者:Frédéric R. Leroux、Hanspeter Mettler
DOI:10.1002/adsc.200600300
日期:2007.2.5
The first modularsynthesis of a family of C1-symmetricdiphosphine ligands is presented. Their synthesis is based on unprecedented highly regioselective halogen/metal interconversions on a common polybrominated biaryl precursor. This methodology allows the functionalization of the ortho- and ortho′-positions of the biaryl core. Diphosphine ligands carrying only one substituent at the 6-position and
PROCESS FOR THE PREPARATION OF ASYMMETRICALLY SUBSTITUTED BIARYLDIPHOSPHINES
申请人:Lonza AG
公开号:EP1761548A1
公开(公告)日:2007-03-14
[EN] PROCESS FOR THE PREPARATION OF ASYMMETRICALLY SUBSTITUTED BIARYLDIPHOSPHINES<br/>[FR] PROCEDE DE PREPARATION DE BIARYLDIPHOSPHINES A SUBSTITUTION ASYMETRIQUE
申请人:LONZA AG
公开号:WO2006002729A1
公开(公告)日:2006-01-12
Provided is a process for the preparation of asymmetrically substituted biaryldiphosphine ligands of the formula (I); wherein R1 is C1-6-alkyl or C3-10 Cycloalkyl optionally being substituted with one or more halogen atoms, and R2 and R3 are independently selected from the group consisting of aryl, C5-10-cycloalkyl and C1-6-alkyl, wherein each aryl moiety is optionally substituted with one or more substituents selected from the group consisting of halogen atoms, nitro, amino, C1-6-alkyl, C1-6-alkoxy and di-C1-6-alkylamino groups, and each C1-6-alkyl, C1-6-alkoxy, di-C1-6-alkyl-amino and C5-10-cycloalkyl group in R2 and R3 optionally being substituted with one or more halogen atoms, from 2,2',6,6'-tetrabromobiphenyl by a sequence of halogen-metal exchanges and subsequent reactions.