Indium(I) Bromide-Mediated Regioselective Markovnikov Hydroselenation, Diselenation and Hydration of Terminal Alkynes with Diphenyldiselenide in Aqueous Media
作者:Clovis Peppe、Ernesto Schulz Lang、Gabriela Nanci Ledesma、Liérson Borges de Castro、Olga Soares do Rego Barros、Paola de Azevedo Mello
DOI:10.1055/s-2005-921931
日期:——
The indium(III) selenolate obtained from indium(I) bromide and diphenyldiselenide promotes, alternatively, the Markovnikov hydroselenation, diselenation or hydration of terminal alkynes, depending on the experimental conditions.
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。
Highly selective perfluoroalkylchalcogenation of alkynes by the combination of iodoperfluoroalkanes and organic dichalcogenides upon photoirradiation
Vinylic selenides and tellurides are useful synthetic intermediates for preparation of vinylic compounds and carbonylcompounds. Herein we report highly selective perfluoroalkylselenation and -telluration of terminal alkynes by using heteroatom mixed systems, i.e., (PhSe)2/RfI and (PhTe)2/RfI, upon photoirradiation. When the reaction of aromatic alkynes and conjugated enynes with diphenyl diselenide
乙烯基硒化物和碲化物是用于制备乙烯基化合物和羰基化合物的有用的合成中间体。在本文中,我们报道了通过使用杂原子混合体系,即(PhSe)2 / R f I和(PhTe)2 / R f I,在光辐照下,对末端炔烃进行高度选择性的全氟烷基硒化和脱乙酰。当芳族炔烃的反应和共轭烯炔与碳酸二苯联硒化物和全氟烷基碘化物在三氟甲苯(BTF)作为溶剂通过照射氙灯通过派热克斯传导(hν> 300nm),炔的新型全氟烷基硒化在区域和立体上发生,以高收率得到1-(全氟烷基)-2-(苯基硒代)烯烃。可以将类似的方法应用于芳族炔烃的光诱导全氟烷基碲化反应,并将全氟烷基和苯基碲基团区域选择性地和立体选择性地引入炔烃的末端和内部位置。由于全氟烷基(氟)基团使得可以通过氟/有机/水萃取技术容易地分离产物,因此所获得的全氟烷基硒代和芳构化产物有望用作合成中间体。
Simultaneous Construction of C−Se And C−S Bonds via the Visible‐Light‐Mediated Multicomponent Cascade Reaction of Diselenides, Alkynes, and SO
<sub>2</sub>
A visible-light mediated multicomponent cascade reaction of diselenides, alkynes, and sulfur dioxide was developed, in which multiple C-Se and C-S bonds were constructed, and unexpected β-sulfonylvinylselane compounds were generated with high selectivity for E configuration. β-Sulfonylvinylselane transformation into 1,4-oxathiine-4,4-dioxide and sulfonylethyne derivates was then investigated. A plausible
Bis-vinyl selenides obtained via iron(iii) catalyzed addition of PhSeSePh to alkynes: synthesis and antinociceptive activity
作者:Glaubia Sartori、José S. S. Neto、Ana Paula Pesarico、Davi F. Back、Cristina W. Nogueira、Gilson Zeni
DOI:10.1039/c2ob27064a
日期:——
In the present study the synthesis and antinociceptive activity of bis-vinyl selenides, prepared via FeCl3 promoted reaction addition of diorganyl dichalcogenides to alkynes, is described. The pharmacological results demonstrated that bis-vinyl selenides 3a, 3d, 3h and 3t elicited antinociceptive effect in the mouse formalin test. The antinociceptive effects of bis-vinyl selenides are not sensitive to electronic effects of the substituents on the aromatic ring directly bonded to the selenium atom. Bis-vinyl selenides 3h and 3t were the most promising molecules for pharmacological purposes since these bis-vinyl selenides were effective in both phases of the formalin test and against edema. A single dose of bis-vinyl selenides 3a, 3d, 3h and 3t did not cause acute toxicity in mice.