Nucleophilic cleavage of lactones and esters with zinc selenolates prepared from diselenides in the presence of Zn/AlCl3
作者:Mohammad Nazari、Barahman Movassagh
DOI:10.1016/j.tetlet.2008.11.036
日期:2009.1
The utility of zinc selenolates for effecting nucleophilic cleavage of simple lactones and esters has been investigated. When zinc selenolate generated via Zn/AlCl3-promoted cleavage of diselenides was reacted with simple lactones and esters, efficient nucleophilic alkyl–oxygenbondcleavage proceeded generating the corresponding carboxylic acids in moderate to excellent yields.
Stereoselective Synthesis of Substituted Tetrahydropyrans and Isochromans by Cyclization of Phenylseleno Alcohols
作者:Andrea Temperini、Anna Barattucci、Paola Maria Bonaccorsi、Ornelio Rosati、Lucio Minuti
DOI:10.1021/acs.joc.5b01199
日期:2015.8.21
A selenium-mediated strategy for the stereoselective synthesis of substituted tetrahydropyrans and isochromans has been developed starting from 5-phenylseleno ketones. After enantioselective reduction, the chiral nonracemic phenylseleno alcohols were oxidized to the conesponding selenones, which underwent an effcient 6-exo-tet ring-closure reaction.