Do the Electronic Effects of Sulfur Indeed Control the π-Selectivity of γ-Sulfenyl Enones? An Investigation
摘要:
The electronic effects of sulfur in gamma-sulfenyl enones are not transmitted to the carbonyl carbon through the pi bond as reported previously. The diastereoselectivity is rather controlled by a combination of several other factors. The steric effects arising from the substituents on the sulfur atom and the gamma-carbon and the bulk of the nucleophile constitute the major control elements.
Do the Electronic Effects of Sulfur Indeed Control the π-Selectivity of γ-Sulfenyl Enones? An Investigation
作者:Veejendra K. Yadav、K. Ganesh Babu、Masood Parvez
DOI:10.1021/jo034608c
日期:2004.5.1
The electronic effects of sulfur in gamma-sulfenyl enones are not transmitted to the carbonyl carbon through the pi bond as reported previously. The diastereoselectivity is rather controlled by a combination of several other factors. The steric effects arising from the substituents on the sulfur atom and the gamma-carbon and the bulk of the nucleophile constitute the major control elements.
Studies toward the oxidative and reductive activation of C–S bonds in 2′-S-aryl-2ʹ-thiouridine derivatives
作者:Ramanjaneyulu Rayala、Alain Giuglio-Tonolo、Julie Broggi、Thierry Terme、Patrice Vanelle、Patricia Theard、Maurice Médebielle、Stanislaw F. Wnuk
DOI:10.1016/j.tet.2016.02.063
日期:2016.4
Studies directed toward the oxidative and reductive desulfurization of readily available 2'-S-aryl-2'-thiouridine derivatives were investigated with the prospect to functionalize the C2'-position of nucleosides. The oxidative desulfurization-difluorination strategy was successful on 2-(arylthio)alkanoate surrogates, while extension of the combination of oxidants and fluoride sources was not an efficient