A General and Practical Palladium-Catalyzed Direct α-Arylation of Amides with Aryl Halides
作者:Bing Zheng、Tiezheng Jia、Patrick J. Walsh
DOI:10.1002/adsc.201300851
日期:2014.1.13
An efficient system for the direct catalytic intermolecular α‐arylation of acetamide derivatives with aryl bromides and chlorides is presented. The palladium catalyst is supported by Kwong’s indole‐based phosphine ligand and provides monoarylated amides in up to 95% yield. Excellent chemoselectivities (>10:1) in the mono‐ and diarylation with aryl bromides were achieved by careful selection of bases
Triphenyl borate catalyzed synthesis of amides from carboxylic acids and amines
作者:Seema A. Ghorpade、Dinesh N. Sawant、Nagaiyan Sekar
DOI:10.1016/j.tet.2018.10.030
日期:2018.11
Herein we report triphenyl borate as a new catalyst for synthesis of amides by catalytic condensation of carboxylic acids and amines. Our protocol is applicable for synthesis of wide range of amides furnishing excellent yields up to 92%. In addition developed method requires low catalyst loading, short time, less amount of solvent, works under air atmosphere and notably no need of azeotropic reflux
P450-catalyzed asymmetric cyclopropanation of electron-deficient olefins under aerobic conditions
作者:Hans Renata、Z. Jane Wang、Rebekah Z. Kitto、Frances H. Arnold
DOI:10.1039/c4cy00633j
日期:——
A histidine-ligated variant of P450-BM3 catalyzes cyclopropanation of a variety of electron-deficient olefins under ambient conditions with great selectivity.
Palladium-Catalyzed Direct Intermolecular α-Arylation of Amides with Aryl Chlorides
作者:Bing Zheng、Tiezheng Jia、Patrick J. Walsh
DOI:10.1021/ol4019002
日期:2013.8.16
An efficient catalytic system for the direct intermolecularα-arylation of acetamide derivatives with aryl chlorides is presented. Chemoselectivities up to 10:1 in the mono- and diarylation of acetamides were achieved by careful selection of bases, solvents, and stoichiometry. Bis-arylated amides were prepared in up to 95% yield.
Iron-catalyzed Chemoselective Cross-coupling of α-Bromocarboxylic Acid Derivatives with Aryl Grignard Reagents
作者:Masayoshi Jin、Masaharu Nakamura
DOI:10.1246/cl.2011.1012
日期:2011.9.5
We have developed a simple and effective synthetic method of α-arylcarboxylic acid derivatives based on the iron-catalyzed cross-coupling reaction of α-bromocarboxylic acid derivatives with aryl Grignard reagents. The reaction proceeds smoothly at −78 °C in a chemoselective manner to produce the coupling product in good to excellent yields.