Picolinamide Ligands: Nickel‐Catalyzed Reductive Cross‐Coupling of Aryl Bromides with Bromocyclopropane and Beyond
作者:Dongyang Han、Jie Sun、Jian Jin
DOI:10.1002/asia.202201132
日期:2023.1.17
The arylcyclopropane motif as the combination of aryl and cyclopropyl ring systems can be found in an increasing amount of approved and investigational drugs. Herein, we have developed a mild, efficient nickel-catalyzed reductive cross-coupling protocol, featuring a simple Ni(II) precatalyst, a novel picolinamide NN2 pincer ligand. Notably, the reaction is tolerant of a broad range of functionalities
芳基环丙烷基序作为芳基和环丙基环系统的组合,可以在越来越多的批准和研究药物中找到。在此,我们开发了一种温和、高效的镍催化还原交叉偶联方案,其特点是一种简单的 Ni(II) 预催化剂,一种新型吡啶酰胺 NN 2钳形配体。值得注意的是,该反应对包括游离胺在内的广泛功能具有耐受性。
Direct Photoexcitable Iodomethylborate Enabling Cyclopropanation of Reactive Alkenes
作者:Rikako Nakamura、Yuto Sumida、Hirohisa Ohmiya
DOI:10.1246/bcsj.20220112
日期:2022.7.15
Radical-mediated cyclopropanation tool for reactive alkenes including dehydroamino acids (DHAAs) has been developed based on directly photoexcitable borate generating iodomethyl radical under visible light irradiation. The borate at the excited state serves as a strong single electron reductant. Therefore, this photoexcitable borate offers a simple protocol for cyclopropanation of DHAAs to forge m
Suzuki Coupling of Cyclopropylboronic Acid With Aryl Halides Catalyzed by a Palladium–Tetraphosphine Complex
作者:Mhamed Lemhadri、Henri Doucet、Maurice Santelli
DOI:10.1080/00397910500330833
日期:2006.2
Abstract The tetraphosphine all‐cis‐1,2,3,4‐tetrakis(diphenylphosphinomethyl)cyclopentane (Tedicyp) in combination with [Pd(C3H5)Cl]2 affords a very efficient catalyst for the coupling of cyclopropylboronic acid with aryl bromides and aryl chlorides. Higher reactions rates were observed with aryl bromides than with aryl chlorides; however, even in the presence of 1–0.4% of catalyst, a few aryl chlorides
Practical Cross-Coupling between O-Based Electrophiles and Aryl Bromides via Ni Catalysis
作者:Zhi-Chao Cao、Qin-Yu Luo、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b02656
日期:2016.12.2
Cross-coupling of various O-based electrophiles with aryl bromides was developed through Ni-catalyzed C–O activation in the presence of magnesium. Beside carboxylates, carbamates, and ethers, phenols exhibited excellent reactivity under modified conditions. This chemistry was featured as a simple and environmentally benign process with low catalyst loading and easy manipulations. The method exhibited