本工作说明了在室温下使用环境友好的碳酸二甲酯(DMC)作为溶剂,H 2 O 2作为氧化剂对硼酸进行氧化的简便有效的方法。与以前的反应报告相反,该报告使用了引起环境问题的金属催化剂,有害试剂和氧化剂。该方法提供了良好或优异的产物收率,并且对硼酸上存在的各种官能团表现出更好的耐受性。而且,就廉价,无毒和容易的反应条件而言,这种发达的方法是一种替代方法。
Air Stable, Sterically Hindered Ferrocenyl Dialkylphosphines for Palladium-Catalyzed C−C, C−N, and C−O Bond-Forming Cross-Couplings
作者:Noriyasu Kataoka、Quinetta Shelby、James P. Stambuli、John F. Hartwig
DOI:10.1021/jo025732j
日期:2002.8.1
aryl halides coupled with acyclic or cyclic secondary alkyl- and arylamines, with primary alkyl- and arylamines, and with aryl- and primary alkylboronicacids. These last couplings provide the first general procedure for reaction of terminal alkylboronicacids with aryl halides without toxic or expensive bases. The ligand not only generates highly active palladium catalysts, but it is air stable in
Aryl–secondary alkyl cross-coupling with aryl sulfonate esters as coupling partners remains a significant challenge. Efficient cross-coupling between aryl/alkenyl triflates and acyclicsecondary alkylboronic acids is realized for the first time to provide a series of sterically congested acyclicsecondary alkyl arenes/olefins in good to excellent yields. The employment of sterically bulky P,PO ligand L1/L2 is
Molecular Oxygen-Mediated Minisci-Type Radical Alkylation of Heteroarenes with Boronic Acids
作者:Lizhi Zhang、Zhong-Quan Liu
DOI:10.1021/acs.orglett.7b03297
日期:2017.12.15
The carbon–carbonbondformation via autoxidation of organoboronic acid using 1 atm of O2 is achieved in a simple, clean, and green fashion. The approach allows a technically facile and environmentally benign access to structurally diverse heteroaromatics with medicinally privileged scaffolds. The strategy also displays its practicality and sustainability in the resynthesis of marketed drugs Crestor
Practical and Modular Construction of C(sp<sup>3</sup>)-Rich Alkyl Boron Compounds
作者:Yangyang Yang、Jet Tsien、Ayala Ben David、Jonathan M. E. Hughes、Rohan R. Merchant、Tian Qin
DOI:10.1021/jacs.0c11964
日期:2021.1.13
Alkyl boronic acids and esters play an important role in the synthesis of C(sp3)-rich medicines, agrochemicals, and material chemistry. This work describes a new type of transition-metal-free mediated transformation to enable the construction of C(sp3)-rich and sterically hindered alkyl boron reagents in a practical and modular manner. The broad generality and functional group tolerance of this method
Halogen‐Bridged Methylnaphthyl Palladium Dimers as Versatile Catalyst Precursors in Coupling Reactions
作者:Nardana Sivendran、Nico Pirkl、Zhiyong Hu、Angelino Doppiu、Lukas J. Gooßen
DOI:10.1002/anie.202110450
日期:2021.11.15
Halide-bridged 1- and 2-methylnaphthyl palladium dimers are presented as convenient, yet highly efficient palladium sources for cross-coupling catalysis. The bench-stable complexes smoothly react with various ligands yielding monoligated palladium precatalysts. These display record-setting activity in various catalytic reactions, clearly beyond that achievable by ligand screening alone.