Palladium and platinum catalyzed hydroselenation of alkynes: SeH vs SeSe addition to CC bond
作者:Valentine P Ananikov、Denis A Malyshev、Irina P Beletskaya、Grigory G Aleksandrov、Igor L Eremenko
DOI:10.1016/s0022-328x(03)00546-1
日期:2003.8
alkynes catalyzed by Pd(PPh3)4 and Pt(PPh3)4 has shown that the palladium complex gives products of both SeH and SeSe bond addition to the triple bond of alkynes, while the platinum complex selectively catalyzes SeH bond addition. The key intermediate of PhSeH addition to the metal center, namely Pt(H)(SePh)(PPh3)2, was detected by 1H-NMR spectroscopy. The analogous palladium complex rapidly decomposes
Highly Stereoselective One-Pot Procedure To Prepare Bis- and Tris-chalcogenide Alkenes via Addition of Disulfides and Diselenides to Terminal Alkynes
作者:Angélica Venturini Moro、Cristina W. Nogueira、Nilda B. V. Barbosa、Paulo Henrique Menezes、João Batista Teixeira da Rocha、Gilson Zeni
DOI:10.1021/jo050448o
日期:2005.6.1
conditions, and the addition of dichalcogenides to alkynes occurred stereoselectively to give exclusively the corresponding Z isomers. We observed that the selectivity control was governed by the effective participation of the hydroxyl group from propargyl alcohols. In addition, the bis-chalcogenide alkenes were exclusively obtained with propargyl alcohol having the acidic hydroxyl group proton. Conversely
A simple and stereoselective synthesis of (Z)-1,2-bis-arylselanyl alkenes from alkynes using KF/Al2O3
作者:Renata G. Lara、Paloma C. Rosa、Liane K. Soares、Márcio S. Silva、Raquel G. Jacob、Gelson Perin
DOI:10.1016/j.tet.2012.08.055
日期:2012.12
The title compounds were synthesized by a one-pot reaction of diaryl diselenides with terminalalkynes avoiding the previous preparation of arylselanyl alkynes. The reactions were performed under mild conditions with a range of terminalalkynes using KF/Al2O3 and PEG-400 as solvent. The addition of diaryl diselenides to alkynes occurred stereoselectively to give exclusively (Z)-1,2-bis-arylselanyl
通过二芳基二硒化物与末端炔烃的一锅反应来合成标题化合物,从而避免了之前制备芳基硒基炔烃的情况。反应在温和条件下,使用KF / Al 2 O 3和PEG-400作为溶剂,在一定范围的末端炔烃下进行。立体选择性地将二芳基二硒化物加成至炔烃中,以良好的收率仅得到(Z)-1,2-双-芳基-杂戊基烯基烯烃。使用微波辐射将反应时间缩短至几分钟,并且KF / Al 2 O 3 / PEG-400系统可以重复使用一次,而无需事先进行类似活性的处理。
Indium(I) iodide-mediated chemio-, regio-, and stereoselective hydroselenation of 2-alkyn-1-ol derivatives
作者:Olga Soares do Rego Barros、Ernesto Shulz Lang、Carlos Alberto Fernandes de Oliveira、Clovis Peppe、Gilson Zeni
DOI:10.1016/s0040-4039(02)01904-4
日期:2002.10
Indium(I) iodide efficiently promotes the chemio-, regio-, and stereoselective hydroselenation of 2-alkyn-1-ol derivatives with diphenyl diselenide to produce the Markovnikov adducts with stereochemistry corresponding to an anti addition of the selenol constituents across the triple bond.
When diphenyldiselenide is heated at 150–180 °C in the presence of acetylenes, an acetylene insertion reaction into the Se–Se bond of the diselenide takes place to provide vic-bis(phenylseleno)alkenes in moderate to high yields.