Borylation using group IV metallocene under mild conditions
作者:Ludovic D. Marciasini、Michel Vaultier、Mathieu Pucheault
DOI:10.1016/j.tetlet.2014.01.080
日期:2014.3
A borylation reaction of aromatic diazonium salts has been optimized using titanocene and zirconocenederivatives as catalysts. The reaction employs diisopropylaminoborane as a borylating agent and proceeds smoothly at room temperature to provide arylboronates after methanolysis and transesterification with pinacol. The reaction mechanism has been found to proceed via a radical pathway.
Method for preparing aminoarylborane compounds or derivatives thereof
申请人:Université de Bordeaux I
公开号:EP2881398A1
公开(公告)日:2015-06-10
The present invention provides a process for the preparation of aminoarylborane compounds and derivatives thereof comprising a step of arylation by reacting an aryl chloride with an aminoborane compound in the presence of a catalytic system.
Typically, the transformation comprises, converting Aryl-chloride Ar-Cl with an aminoborane such as
into an aminoarylborane compound of the following formula:
Synthesis of Phenylboronic Acids in Continuous Flow by Means of a Multijet Oscillating Disc Reactor System Operating at Cryogenic Temperatures
作者:Dagfinn Sleveland、Hans-René Bjørsvik
DOI:10.1021/op3000493
日期:2012.5.18
oscillating disk (MJOD) millireactor system suitable for operating at cryogenic temperatures has been developed, assembled, and investigated. This new reactor system (cryoMJOD) was realized with the purpose to prepare various phenylboronic acids in a continuous two (three)-step telescoped synthetic process at temperatures in the interval −50 to −75 °C. In this process, n-butyllithium was reacted with a phenylbromide
Mild and Selective Synthesis of an Aryl Boronic Ester by Equilibration of Mixtures of Boronic and Borinic Acid Derivatives
作者:Vanessa F. Hawkins、Mark C. Wilkinson、Matthew Whiting
DOI:10.1021/op800169s
日期:2008.11.21
of aryl Grignardreagents with 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (isopropyl pinacol borate) under noncryogenic conditions can lead to mixtures of the corresponding boronic ester along with, generally undesired, borinic acid derivatives. We have found that in certain cases gentle heating of the crude reaction mixtures leads to complete equilibration to give the borinic esters as the
Substituted 3-amino biaryl propionic acids as potent VLA-4 antagonists
作者:Ihor E Kopka、Linus S Lin、Richard A Mumford、Thomas Lanza、Plato A Magriotis、David Young、Stephen E DeLaszlo、Malcolm MacCoss、Sander G Mills、Gail Van Riper、Ermengilda McCauley、Kathryn Lyons、Stella Vincent、Linda A Egger、Usha Kidambi、Ralph Stearns、Adria Colletti、Yohannes Teffera、Sharon Tong、Karen Owens、Dorothy Levorse、John A Schmidt、William K Hagmann
DOI:10.1016/s0960-894x(02)00460-2
日期:2002.9
A series of substituted N-(3,5-dichlorobenzenesulfonyl)-(L)-prolyl- and (L)-azetidyl-beta-biaryl beta-alanine derivatives was prepared as selective and potent VLA-4 antagonists. The 2,6-dioxygenated biaryl substitution pattern is important for optimizing potency. Oral bioavailability was variable and may be a result of binding to circulating plasma proteins. (C) 2002 Elsevier Science Ltd. All rights reserved.