SmI<sub>2</sub>-Catalyzed Intermolecular Coupling of Cyclopropyl Ketones and Alkynes: A Link between Ketone Conformation and Reactivity
作者:Soumitra Agasti、Nicholas A. Beattie、Joseph J. W. McDouall、David J. Procter
DOI:10.1021/jacs.1c01356
日期:2021.3.10
The archetypal single electron transfer reductant, samarium(II) diiodide (SmI2, Kagan’s reagent), remains one of the most important reducing agents and mediators of radical chemistry after four decades of widespread use in synthesis. While the chemistry of SmI2 is very often unique, and thus the reagent is indispensable, it is almost invariably used in superstoichiometric amounts, thus raising issues
Alkyl Cyclopropyl Ketones in Catalytic Formal [3 + 2] Cycloadditions: The Role of SmI<sub>2</sub> Catalyst Stabilization
作者:Jack I. Mansell、Song Yu、Muze Li、Emma Pye、Chaofan Yin、Frédéric Beltran、James A. Rossi-Ashton、Ciro Romano、Nikolas Kaltsoyannis、David J. Procter
DOI:10.1021/jacs.4c03073
日期:——
the use of SmI2 as a catalyst in combination with substoichiometric amounts of Sm0; the latter likely acting to prevent catalyst deactivation by returning SmIII to the catalytic cycle. In the absence of Sm0, background degradation of the SmI2 catalyst can outrun product formation. For the most recalcitrant alkyl cyclopropyl ketones, catalysis is “switched-on” using these new robust conditions, and otherwise