نتایج جستجو برای: vinylsilane

تعداد نتایج: 25  

Journal: :Chemical communications 2014
Béatrice Quiclet-Sire Yuuki Yanagisawa Samir Z Zard

The peroxide initiated radical addition of dithiocarbonates (xanthates) to trialkoxy vinylsilanes leads to functionalized trialkoxysilanes. Prior addition of the dithiocarbonates to an alkene before reaction with the vinylsilane can be used to increase the complexity of the final product.

Journal: :Journal of the American Chemical Society 2011
Mark G Nilson Raymond L Funk

A concise, diastereoselective total synthesis of (±)-cortistatin J has been completed in 20 steps from furan. Key steps include an intramolecular [4 + 3] cyclization of a disubstituted furan with a (Z)-2-(trialkylsilyloxy)-2-enal to construct the tetracyclic core and a (Z)-vinylsilane/iminium ion cyclization to form the A ring.

2012
Zhenhua Ding Naohiko Yoshikai

Direct C2-alkylation of an indole bearing a readily removable N-pyrimidyl group with a vinylsilane was achieved by using a cobalt catalyst generated in situ from CoBr(2), bathocuproine, and cyclohexylmagnesium bromide. The reaction allows coupling between a series of N-pyrimidylindoles and vinylsilanes at a mild reaction temperature of 60 °C, affording the corresponding alkylated indoles in mod...

2018
Dorina G. Dobó Dániel Sipos András Sápi Koppány L. Juhász Ákos Kukovecz Zoltán Kónya

Pt nanoparticles with controlled sizes between 1.6–7.0 nm were anchored onto the surface and pores of SBA-15 silica support. The catalysts were characterized by TEM-ED, BET, XRD, and ICP-MS techniques and were tested in liquid phase hydrosilylation of phenylacetylene with triethylsilane. The activity of the 7.0 nm Pt nanoparticles anchored onto the surface of SBA-15 in hydrosilylation (TOF = 0....

Journal: :Chemical communications 2012
Manuel Iglesias María Pérez-Nicolás Pablo J Sanz Miguel Victor Polo Francisco J Fernández-Alvarez Jesús J Pérez-Torrente Luis A Oro

A synthon for a 14-electron Ir(III) species is described. The geometrical control exerted by the ligand system over the Ir-alkenyl intermediate in hydrosilylation of terminal alkynes precludes formation of the more thermodynamically stable β-(E)-vinylsilane, thus affording the β-(Z) isomer in excellent yields.

Journal: :Chemical communications 2013
Lu Gao Ji Lu Zhenlei Song Xinglong Lin Yongjin Xu Zhiping Yin

An unusual [1,5]-Brook rearrangement of the lithium alkoxide of geminal bis(silyl) homoallylic alcohol is described. The unique steric and electronic effects of geminal bis(silane) were found to be crucial for promoting this long-range silyl migration, as well as for facilitating the subsequent γ/Z-selective addition of silyl allyllithium with carbonyl compounds to synthesize diverse configurat...

Journal: :Dalton transactions 2015
Bogdan Marciniec Sylwia Kostera Bożena Wyrzykiewicz Piotr Pawluć

The ruthenium hydride complex-catalyzed N-silylation of primary and secondary amines with substituted vinylsilanes, with the general formula R(1)CH=CHSiR (where R(1) = H, Ph, n-Bu, Si(OEt)3), leading to the formation of a Si-N bond with the evolution of olefin is described. Vinylsilane acts as a silylative reagent and hydrogen acceptor. Under optimum conditions, the reaction offers an attractiv...

Journal: :Organic & biomolecular chemistry 2003
Lisbet Kvaernø Per-Ola Norrby David Tanner

A vinylsilane-ketiminium ion cyclization involving iminium species derived from amines 6 and 7 was investigated experimentally as a possible approach to some biologically interesting 1-azaspirocycles. However, even under conditions of microwave irradiation at high temperatures no such cyclization was observed whereas (in line with previous results) the corresponding vinylsilane-aldiminium ion c...

Journal: :Chemical science 2017
Terence T-L Kwan Omar Boutureira Elizabeth C Frye Stephen J Walsh Moni K Gupta Stephen Wallace Yuteng Wu Fengzhi Zhang Hannah F Sore Warren R J D Galloway Jason W Chin Martin Welch Gonçalo J L Bernardes David R Spring

Transition metal catalysis has emerged as a powerful strategy to expand synthetic flexibility of protein modification. Herein, we report a cationic Ru(ii) system that enables the first example of alkyne hydrosilylation between dimethylarylsilanes and O-propargyl-functionalized proteins using a substoichiometric amount or low-loading of Ru(ii) catalyst to achieve the first C-Si bond formation on...

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