New synthetic routes to vinyl sulfides, ketene thioacetals and their seleno analogues from carbonyl compounds
作者:J.N. Denis、S. Desauvage、L. Hevesi、A. Krief
DOI:10.1016/s0040-4039(01)82051-7
日期:1981.1
Title compounds have been prepared from carbonyl compounds by formal removal of hydroxyl and sulfenyl or hydroxyl and selenyl moieties from the corresponding functionalized β-hydroxysulfides or β-hydroxyselenides.
1,1-Dibromoalkenes as versatile reagents to a transition metal-free and stereoselective synthesis of ( E )-1-bromo-1-selenoalkenes and ketene selenoacetals
作者:Rodrigo Webber、Thiago J. Peglow、Patrick C. Nobre、Angelita M. Barcellos、Juliano A. Roehrs、Ricardo F. Schumacher、Gelson Perin
DOI:10.1016/j.tetlet.2016.07.018
日期:2016.9
We describe here a metal-free and selective method for the synthesis of (E)-1-bromo-1-seleno alkenes and ketene selenoacetals by a stoichiometric and temperature-controlled reaction. These protocols employ a diverse array of 1,1-dibromoalkenes and different diaryl diselenides to afford the corresponding products in good yields and in a short reaction time.
unprecedented geminal olefinic dichalcogenation of alkenyl sulfonium salts with dichalcogenides ArYYAr (Y = S, Se, Te) is reported, providing various trisubstituted 1,1-dichalcogenalkenes [Ar1CH = C(YAr2)2] in a highly selective manner under mild and catalyst-free conditions. The key process involves the formation of two geminal olefinic C–Y bonds viasequential C–Y cross-coupling and C–H chalcogenation. A