Magdesieva, N. N.; Kyandzhetsian, R. A.; Kirpichenok, M. A., Journal of Organic Chemistry USSR (English Translation), 1981, vol. 17, # 12, p. 2279 - 2284
Magdesieva, N. N.; Kyandzhetsian, R. A.; Kirpichenok, M. A., Journal of Organic Chemistry USSR (English Translation), 1981, vol. 17, # 12, p. 2279 - 2284
A visible-light-induced oxidativecoupling of diselenides with readily available vinylarenes is demonstrated. This benign protocol allows one to access a wide range of α-aryl and α-alkyl selenomethyl ketones in good yields with excellent functional group compatibility. The distinct advantages of this protocol over all previous methods include the use of a green solvent and air as an oxidant and the
Expeditious and Chemoselective Synthesis of α-Aryl and α-Alkyl Selenomethylketones via Homologation Chemistry
作者:Raffaele Senatore、Laura Castoldi、Laura Ielo、Wolfgang Holzer、Vittorio Pace
DOI:10.1021/acs.orglett.8b00896
日期:2018.5.4
Diselenoacetals, previously considered byproducts in homologation tactics en route to α-selenoketones, are herein found to be excellent starting materials for this purpose. The easy selenium/lithium exchange they undergo affords seleno carbanions which are smoothly added to Weinreb amides to chemoselectively prepare α-aryl- and α-alkyl seleno methylketones through a single chemical operation. No racemization
selenoesters 1c and 1i with diazomethane resulted in crossover, with the formation of all four possible α-seleno ketones 2b, 2c, 2h and 2i. A non-concerted mechanism involving attack by the diazo compound upon the acyl carbon atom of an activated selenoester with the formation of a tetrahedral intermediate 11 has been suggested. The reaction of the selenothiocarbamate 4 with diazomethane resulted in 1,3-dipolar