Transfer C–H borylation is an isodesmic approach to the borylation reaction using B–C-containing molecules as boron sources. In this work, we report that 2-mercaptothiazole and other analogues are active for the metal-free borylation of heterocycles and terminalalkynes. Alkynes are challenging substrates to C–H borylate because they undergo side reactions with most borylating agents. The ability of
Stereocontrolled Synthesis of Vinyl Boronates and Vinyl Silanes via Atom‐Economical Ruthenium‐Catalyzed Alkene–Alkyne Coupling
作者:Barry M. Trost、Dennis C. Koester、Alastair N. Herron
DOI:10.1002/anie.201509238
日期:2015.12.21
The synthesis of vinyl boronates and vinyl silanes was achieved by employing a Ru‐catalyzed alkene–alkyne coupling reaction of allyl boronates or allylsilanes with various alkynes. The double bond geometry in the generated vinyl boronates can be remotely controlled by the juxtaposing boron‐ and silicon groups on the alkyne substrate. The synthetic utility of the coupling products has been demonstrated
Novel 3-hydroxy vinylboronates influence sphingolipid metabolism, cause apoptosis in Jurkat cells and prevent tumor development in nude mice
作者:Alina Botvinik Livshits、Abed Al Aziz Al Quntar、Zhanna Yekhtin、Morris Srebnik、Arie Dagan
DOI:10.1016/j.bmcl.2012.11.028
日期:2013.1
A series of novel 3-hydroxy vinylboronates which share structural similarities with sphingolipids were synthesized and tested in vitro and in vivo as anticancer agents. The molecules reduced cancer cell survival in vitro by influencing their sphingolipid metabolism. In a cancer model in nude mice the lead compound E7 prevented the development of tumor as long as the treatment period continued. Moreover, it delayed tumor growth after the treatment was finished. (C) 2012 Elsevier Ltd. All rights reserved.