A Pd-catalyzed, boron ester-mediated, reductive cross-coupling of two aryl halides to synthesize tricyclic biaryls
作者:Zhilong Chen、Xiaodong Wang
DOI:10.1039/c7ob01237c
日期:——
Tricyclic biaryls are important scaffold structures in many natural products and lead compounds in drug discovery. The formation of a biaryl unit is often the key step for the synthesis of tricyclic biaryls. Despite significant progress toward the synthesis of biaryl compounds in recent years, the direct cross-coupling of two different aryl halides is still challenging and robust methods are lacking
Transition Metal Complexes and Preparation Methods Thereof
申请人:Lee Choong-Hoon
公开号:US20090030221A1
公开(公告)日:2009-01-29
The present invention provides a novel mononuclear transition metal compound, a novel binuclear transition metal compound, a novel organic amine or phosphorous compound, and a method for preparing the same. The mononuclear transition metal compound according to the present invention is configured such that a cyclopentadienyl group and an amido or phosphorous group are bridged via a phenylene bridge. The binuclear transition metal compound according to the present invention is configured such that the two bridged mononuclear transition metal compounds configured such that a cyclopentadienyl group and an amido or phosphorous group are bridged via a phenylene bridge are linked via a bridging group located at the phenylene bridge. According to the present invention, the mononuclear transition metal compound, the binuclear transition metal compound, the organic amine or phosphorous compound can be prepared in a simple manner by using suzuki-coupling reaction with a high yield.
Decarboxylative sp3 C–N coupling via dual copper and photoredox catalysis
作者:Yufan Liang、Xiaheng Zhang、David W. C. MacMillan
DOI:10.1038/s41586-018-0234-8
日期:2018.7
to construct sp2 carbon–nitrogen (C–N) bonds using palladium, copper or nickel catalysis1,2. However, the incorporation of alkyl substrates to form sp3 C–N bonds remains one of the major challenges in the field of cross-coupling chemistry. Here we demonstrate that the synergistic combination of coppercatalysis and photoredoxcatalysis can provide a general platform from which to address this challenge
An efficient palladium-catalyzed amination, including polyaminations of aromatic bromides mediated on a surface of KF-alumina, is reported. The solvent-free one-pot protocol avoids the use of a strong base (sodium tert-butoxide) making it applicable to substrates containing a base-sensitive functional group. It proceeds without concomitant reductive bromination and provides access to selective amination of polyhaloaromatics.
Enantioselective synthesis of 2-methyl indolines by palladium catalysed asymmetric C(sp3)–H activation/cyclisation
作者:Saithalavi Anas、Alex Cordi、Henri B. Kagan
DOI:10.1039/c1cc14292e
日期:——
activation by an intramolecular ArPdX species and subsequent cyclisation was developed. Palladium catalysts using commercially available chiral diphosphines yield good ee's (up to 93% ee) in the synthesis of 2-methyl indolines from 2-halo N-isopropyl anilides. This approach was also employed for the synthesis of enantioenriched cyclohexyl fused indolines with moderate enantioselectivities.