A Seleno-Pummerer Rearrangement of Haloselenuranes
作者:Juzo Nakayama、Yoshiaki Sugihara
DOI:10.1246/cl.1988.1317
日期:1988.8.5
When heated or treated with triethylamine in tetrahydrofuran, diacetonyl- and diphenacylselenium dichlorides and their derivatives undergo seleno-Pummerer rearrangement to give the corresponding α-chloro selenides in good yields.
A facile preparation of α,α′-dicarbonylselenides has been performed by reaction of α-carbonyl selenocyanates with an enolate, electrogenerated by reduction of a carbon–halogen bond.
Reduction of α,α′-diketo selenides with a low-valenttitaniumreagent usually affords 3,4-dihydroxyselenolanes, from which the corresponding selenophenes are obtained by acid-catalyzed dehydration. A surprising exception is the formation of 2,4-dihydroxy- 2,4-di--butylselenolane from bis(2--butyl-2-oxoethyl) selenide, the former being converted to 2,4-di--butylselenophene by acid treatment.
Synthesis of Bis(arylethynyl) Selenides by One-Pot Protocol
作者:Yun-Xing Zhu、Zi-Jian Zhao、Yang Zhang、Qiong Su、Zhi-Hong Peng、De-Lie An
DOI:10.1002/hc.21208
日期:2015.1
An efficient method without using terminal arylacetylenes as substrates for the synthesis of bis(arylethynyl) selenides 1 (ArCCSeCCAr) was described, and a series of compounds 1a−1m have been obtained by a one-pot three-step strategy from the corresponding bis(arylethanonyl) selenides. The mechanism was identified through trapping and characterization of a key intermediate 2a, and an elimination using
Breaking bonds with electrons: stepwise and concerted reductive cleavage of C–S, C–Se and Se–CN bonds in phenacylthiocyanates and phenacylselenocyanates
作者:Lydia M. Bouchet、Alicia B. Peñéñory、Marc Robert、Juan E. Argüello
DOI:10.1039/c4ra16154h
日期:——
1e), and a concerted mechanism is favoured for compounds bearing an electron-donating or no substituent on the phenyl ring (1a–c). A regioselective bondcleavage leads to the fragmentation of the CH2–S bond with all compounds 1a–e, further yielding the corresponding 1,4-diketone (3) as products. Contrastingly, with phenacylselenocyanates (2), two different reductivecleavages occur involving the breaking