A practical method for the umpolung selenocyanation of aryl ketones, alkyl ketones, β-ketoesters and electron-rich arenes has been developed, affording various selenocyanates in moderate to excellent yields. This transformation proceeds by an oxidative umpolung selenocyanation through nitrogen oxides-mediated electrophilic selenocyanation process. This method is simpler, more efficient, and less costly
A novel metal-free method for the selenocyanation of aromatic ketones to afford α-carbonyl selenocyanates
作者:Kai Sun、Yunhe Lv、Yao Chen、Tingting Zhou、Yanyan Xing、Xin Wang
DOI:10.1039/c7ob00958e
日期:——
new method has been developed for the selenocyanation of aromatic ketones. This reaction avoids the need to use pre-prepared α-halo ketones, providing rapid access to α-carbonyl selenocyanates. We also investigated the mechanism for this reaction and found that it proceeds via sequential radical iodination and nucleophilicsubstitution reactions.
Selenocyanation of Aryl and Styryl Methyl Ketones in the Presence of Selenium Dioxide and Malononitrile: An Approach for the Synthesis of α-Carbonyl Selenocyanates
作者:Ibakyntiew D. Marpna、Kmendashisha Wanniang、Tyrchain Mitre Lipon、O. Risuklang Shangpliang、Bekington Myrboh
DOI:10.1021/acs.joc.0c02630
日期:2021.1.15
α-carbonyl selenocyanates from aryl methyl ketones/styryl methyl ketones using selenium dioxide as the selenating agent under simple reaction conditions. This reaction has notable advantages over the traditional methods in terms of accessibility and affordability of the starting materials. The method features the interaction of aryl methyl ketones/styryl methyl ketones with selenium dioxide and malononitrile
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