Lewis Acid-Catalyzed Hydrometalation and Carbometalation of Unactivated Alkynes
作者:Naoki Asao、Yoshinori Yamamoto
DOI:10.1246/bcsj.73.1071
日期:2000.5
carbostannation of unactivatedalkynes with organosilanes, or organostannanes proceed effectively in the presence of catalytic amounts of Lewis acids to produce the corresponding vinylsilyl or vinylstannyl compounds in a highly regio- and stereoselective way. Although it is well known that transition metal catalyzed hydrometalations and carbometalations, in general, proceed in a cis-manner, the Lewis acid-catalyzed
A number of alkynes 5, allene 11 and alkene 13 smoothly underwent hydrostannation with tributyltin hydride 1, prepared in situ from tributylchlorostannane 6 and triethylsilane 7 in the presence of catalytic amounts of Lewis acids.
Copper-catalyzed α-selective hydrostannylation of alkynes for the synthesis of branched alkenylstannanes
作者:H. Yoshida、A. Shinke、Y. Kawano、K. Takaki
DOI:10.1039/c5cc02720a
日期:——
A universal system for highly α-selective hydrostannylation of terminal alkynes has been developed by use of a distannane or a silylstannane as a stannylating reagent under copper catalysis.
The Stannum–Ene Reactions of Benzyne and Cyclohexyne with Superb Chemoselectivity for Cyclohexyne
作者:Lianggui Li、Chunhui Shan、Jiarong Shi、Wensheng Li、Yu Lan、Yang Li
DOI:10.1002/anie.202117351
日期:2022.4.19
The stannum–ene reactions of both benzyne and cyclohexyne were realized, which is particularly suitable for cyclohexyne with a broad substrate scope and excellent chemoselectivity.
实现了苯炔和环己炔的锡-烯反应,特别适用于环己炔,具有广泛的底物范围和优异的化学选择性。
<i>Z</i>-Selective Hydrostannylation of Terminal and Internal C–C Triple Bonds Initiated by the Trityl Cation
作者:Francis Forster、Victoria M. Rendón López、Martin Oestreich
DOI:10.1021/acs.organomet.8b00409
日期:2018.8.27
of n-Bu3SnH across terminal and internal alkynes, including related α,β-unsaturated carboxyl compounds, is reported. The reaction is initiated by the trityl salt [Ph3C]+[B(C6F5)4]− and proceeds through β-tin-stabilized vinyl cations. Their reduction by hydride transfer from n-Bu3SnH explains the high Z-selectivity in the formation of the vinyl stannanes.