A general and mostly highlystereoselective method for effective synthesis of 1-boryl-3-(silyl)propenes via one-step catalytic processes, i.e. silylative coupling of vinylsilanes with allyl boronates, borylative coupling of vinyl boronates with allylsilanes catalysed by [RUHCl(CO)(PCy 3 ) 2 ] and cross-metathesis of respective derivatives in the presence of Grubbs catalysts, is described.
A new highly selective method for the synthesis of borasiloxanes through the O-borylation of silanols, disilanols, and disiloxanediols with vinylboronates in the presence of Ru0 complexes (mainly Ru3CO12) is described. The method leads to the formation of special compounds with a B–O–Si inorganic framework. When Ru0 complexes are used as a catalyst, no vinylboronate homocoupling is observed. A mechanism
Ruthenium(II) Complex Catalyzed O-Borylation of Alcohols with Vinylboronates
作者:Bogdan Marciniec、Jędrzej Walkowiak
DOI:10.1055/s-0029-1217732
日期:2009.9
method for the selective synthesis of boryl ethers via O-borylation of alcohols with vinylboronates catalyzed by the Ru-H complexes [Ru(CO)C]H(PPh 3 ) 3 ] and [Ru(CO)CIH(PC Y3 ) 2 ] is described. The mechanism of catalysis of this new de-ethenative borylation is supported by equimolar reaction of Ru-B complex with alcohol.
A new, highly selective method for effective synthesis of boryl silyl ethers (borasiloxanes) via O-borylation of silanols with vinylboronates catalyzed by the Ru-H complexes [RuHCl(CO)(PCy3)2] and [RuHCl(CO)(PPh3)3] is described.
The co-dimerization reaction of vinylboronates with terminal alkynes, which was discovered in our group, is an efficient method for the synthesis of boryl- and borylsilylsubstituted buta-1,3-dienes. This study is a continuation of our previous and present results concerning the mechanism of this new catalytic reaction in boron chemistry. DFT calculations, as well as kinetic measurements carried out at several different temperatures in the range of 70-100 degrees C, provided rational grounds for the mechanism proposed previously on basis of stoichiometric reactions monitored by H-1 NMR. The activation energy and the rate determining step were also estimated. (C) 2014 Elsevier B.V. All rights reserved.