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 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.
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.
Available online-1-n-butyl-3-methylimidazolium selenocyanate ([bmim][SeCN]) proved to be a very efficient reagent for selenocyanation of alkyl halides. As part of an eco-friendly process, no organic solvents were used during the transformation and reaction times are reduced by using microwave as a heating source. The ionicliquid was carefully recycled in two different ways. Selenocyanate compounds
Transition-Metal-Free HFIP-Mediated Organo Chalcogenylation of Arenes/Indoles with Thio-/Selenocyanates
作者:Pratibha Kalaramna、Avijit Goswami
DOI:10.1021/acs.joc.1c00478
日期:2021.7.16
developed a protocol for the synthesis of diaryl thio-/selenoethers by the reaction of aryl chalcogenocyanates with electron rich arenes/hetero arenes via HFIP promoted C–H activation. The reaction produces chalcogenides in good to excellent yields undermildconditions without the need of a transition metal as a catalyst. The HFIP-mediated reactions tolerated a wide range of functional groups and set the stage