Photo-induced thiolate catalytic activation of inert Caryl-hetero bonds for radical borylation
作者:Shun Wang、Hua Wang、Burkhard König
DOI:10.1016/j.chempr.2021.04.016
日期:2021.6
the activation of bonds with high bond dissociation energy and to substrates with high reduction potentials. Herein, we introduce a novel photocatalytic strategy for the activation of inert substituted arenes for aryl borylation by using thiolate as a catalyst. This catalytic system exhibits strong reducing ability and engages non-activated Caryl–F, Caryl–X, Caryl–O, Caryl–N, and Caryl–S bonds in productive
Dioxime oxalates; new iminyl radical precursors for syntheses of N-heterocycles
作者:Fernando Portela-Cubillo、James Lymer、Eoin M. Scanlan、Jackie S. Scott、John C. Walton
DOI:10.1016/j.tet.2008.08.112
日期:2008.12
an atom-efficient way of generating iminylradicals. The process was most efficient for dioxime oxalates having aryl substituents attached to their CN bonds. The method was useful for EPR spectroscopic study of iminyl and iminoxyl radicals. Photolyses in toluene solution, of dioxime oxalates containing alkenyl acceptor groups, yielded unsaturated iminylradicals that ring closed to afford 3,4-dihydro-2H-pyrroles
From dioxime oxalates to dihydropyrroles and phenanthridines via iminyl radicals
作者:Fernando Portela-Cubillo、Eoin M. Scanlan、Jackie S. Scott、John C. Walton
DOI:10.1039/b808625g
日期:——
Dioxime oxalates are useful precursors for the clean generation of iminyl radicals by sensitised UV photolysis and can be adapted for serviceable preparations of 3,4-dihydro-2H-pyrroles and phenanthridines.
From the bottle: simple iron salts for the efficient synthesis of pyrrolidines <i>via</i> catalytic C–H bond amination
作者:Wowa Stroek、Lilian Hoareau、Martin Albrecht
DOI:10.1039/d2cy02065c
日期:——
Commercially available iron salts FeX2 are remarkably active catalysts for pyrrolidine formation from organic azides via direct C–H bond amination. With FeI2, amination is fast and selective, (<30 min for 80% yield at 2 mol% loading), TONs up to 370 are reached with just 0.1 mol% catalyst, different functional groups are tolerated, and a variety of C–H bonds were activated.