Pd-Catalyzed Regio- and Stereoselective Addition of Boronic Acids to Silylacetylenes: A Stereodivergent Assembly of β,β-Disubstituted Alkenylsilanes and Alkenyl Halides
Pd-catalyzed addition of boronicacids to silylacetylenes is described, providing β,β-disubstituted (E)- or (Z)-alkenylsilanes in satisfactory yields with excellent regio- and stereoselectivity under mild reaction conditions. It represents the first highly regio- and stereoselective addition of boronicacids to aryl and alkenyl silylacetylenes. Moreover, the sequential Pd-catalyzed boron addition/N-halosuccinimide-mediated
Cross‐dehydrogenativecoupling of various terminalalkynes and monohydrosilanes efficiently proceeded in the presence of gold supported on OMS‐2 (Au/OMS‐2) using O2 as a terminal oxidant, affording the corresponding alkynylsilanes in moderate to high yields (see picture). The observed catalysis was truly heterogeneous, and the catalyst could be reused at least ten times without a significant loss of
Compounds of the formula (I), in which X
1
, X
2
, X
3
, X
4
, R
1
, R
2
, R
3
and R
4
have the meanings indicated in Claim
1
, are inhibitors of tyrosine kinases, in particular Met kinase, and can be employed, inter alia, for the treatment of tumours.
Direct C(<i>sp</i>)–H/Si–H Cross-Coupling via Copper Salts Photocatalysis
作者:Qi-Chao Gan、Zi-Qi Song、Chen-Ho Tung、Li-Zhu Wu
DOI:10.1021/acs.orglett.2c02022
日期:2022.7.22
cross-coupling by photocatalysis. In terms of cheap and readily available starting materials, a series of alkynylsilanes are prepared in good to excellent yields upon visible-light irradiation of CuCl and alkynes with silane. The large scale reaction with flow chemistry and late-stage functionalization of natural products shows the potential of the transformation in practical organic synthesis of the alkynylsilanes
Base-mediated one-pot synthesis of alkynylsilanes from terminal alkynes and chlorosilanes
作者:Jianyang Chen、Hongmei Fu、Huamei He、Shuting Liang、Xiaofeng Luo
DOI:10.1016/j.tet.2024.133823
日期:2024.2
An efficient one-pot method has been developed to synthesize alkynylsilanes from terminalalkynes by treatment with chlorosilanes and LiN(SiMe3)2. The reaction proceeded smoothly at room temperature, showing a broad substrate scope and good functional group tolerance. The practical application was demonstrated by gram-scale reaction.