Environmentally friendly homocoupling reaction of functionalized potassium aryl trifluoroborates salts in aqueous media
摘要:
The homocoupling reaction between potassium aryl trifluoroborates containing different functionalities promoted by a catalytic amount of Pd(OAc)(2) is described. The methodology uses water as a solvent under aerobic conditions to give the corresponding biaryl compounds in good yields. (C) 2011 Elsevier Ltd. All rights reserved.
Copper-catalyzed amination of potassium aryl trifluoroborates using aqueous ammonia
作者:André P. Liesen、Arisson T. Silva、jokderléa C. Sousa、Paulo H. Menezes、Roberta A. Oliveira
DOI:10.1016/j.tetlet.2012.06.011
日期:2012.8
The conversion of potassium aryl trifluoroborates containing different functionalities into the corresponding aryl amines using a catalytic amount of CuSO4·5H2O is described. The methodology uses water as a solvent under aerobic conditions to give the products in good yields.
Palladium-Catalyzed Regioselective Arylation of Arene C-H Bond Assisted by the Removable 2-Pyridylsulfinyl Group
作者:Yuhong Zhang、Xunbin Zhang、Ming Yu、Jinzhong Yao
DOI:10.1055/s-0031-1290320
日期:2012.2
A palladium-catalyzed arylation of arene C-H bond assisted by a removable 2-pyridylsulfinyl group is described. The reaction employs aryltrifluoroborates as the arylation reagent, leading to the corresponding products in moderate to good yield with broad substrate scope. The directinggroup can be removed or converted to other useful functionalities, which showcases the potential synthetic application
Synthesis and Applications of α-Trifluoromethylated Alkylboron Compounds
作者:O. Andreea Argintaru、DaWeon Ryu、Ioana Aron、Gary A. Molander
DOI:10.1002/anie.201308036
日期:2013.12.16
RBF3K is a chemist's BFF: A metal‐free synthetic route to unprecedented organoboron compounds bearing an α‐trifluoromethyl substituent, employing a variety of trifluoroborate (RBF3K) starting materials, is reported. These substrates represent the first isolated α‐trifluoromethylated alkylboron building blocks, and these reagents lead to a variety of useful bench‐stable, synthetic intermediates. Pin=pinacol
Palladium-Catalyzed Borylation of Aryl and Heteroaryl Halides Utilizing Tetrakis(dimethylamino)diboron: One Step Greener
作者:Gary A. Molander、Sarah L. J. Trice、Steven M. Kennedy
DOI:10.1021/ol302124j
日期:2012.9.21
borylating agent, tetrakis(dimethylamino)diboron [(Me2N)2B–B(NMe2)2], is reported. The method is complementary to the previously reported method utilizing bis-boronic acid (BBA) in that certain substrates perform better under one set of optimized reaction conditions than the other. Because tetrakis(dimethylamino)diboron is the synthetic precursor to both BBA and bis(pinacolato)diboron (B2Pin2), the new
Scope of the Palladium-Catalyzed Aryl Borylation Utilizing Bis-Boronic Acid
作者:Gary A. Molander、Sarah L. J. Trice、Steven M. Kennedy、Spencer D. Dreher、Matthew T. Tudge
DOI:10.1021/ja303181m
日期:2012.7.18
wasteful reagents to prepare boronic acid derivatives and require additional steps to afford the desired boronic acid. The scope of the previously reported palladium-catalyzed, direct boronic acid synthesis is unveiled, which includes a wide array of synthetically useful aryl electrophiles. It makes use of the newly available second generation Buchwald XPhos preformed palladium catalyst and bis-boronic