A novel dehydrogenative coupling
reaction of N-fluorocarboxamides with polyfluoroarenes
forming C(sp2)–C(sp3) bonds enabled by
copper catalysis has
been accomplished. N-Fluorocarboxamides are postulated
to undergo copper-mediated dehydrogenative cross-coupling reaction
with electron-deficient polyfluoroarenes via a radical pathway. Benzylic
C–H bonds and aliphatic C–H bonds in N-fluorocarboxamides could proceed smoothly and demonstrated excellent
regioselectivity. The detailed mechanism presented is supported by
control experiments and density functional theory calculations.
C-Aryl glycosides are of high value as drug candidates. Here a novel and cost-effective nickel catalyzed ortho-CAr-H glycosylation reaction with high regioselectivity and excellent α-selectivity is described. This method shows...
A metal-free brand-new one-pot multinitrogenation of amides for the chemo- and regioselective synthesis of 1,5-disubstituted tetrazoles has been developed. By means of electrophilic amide activation, and further C-C bond cleavage and rearrangement, a diverse set of functionalized 1,5-DST derivatives were selectively constructed under mild conditions. As showcased in the mechanisms, the chemoselectivity is easily switched by the selection of the starting materials in the reaction.
A new method for the efficient synthesis of hexahydro-1H-fluorene and octahydrobenzo[a]azulene derivatives through a ring-expansion strategy is reported. With an appropriate combination of thulium(III) trifluoromethanesulfonate and 13X molecular sieves, a range of unsaturated polycyclic compounds were obtained in good yields. Mechanism studies reveal that the reaction is more likely to undergo Meyer−Schuster rearrangement, ring expansion, and Friedel−Crafts-type pathways, which provide a conceptually different strategy for the ring opening of tertiary cycloalkanols.
Construction of C(sp2)−C(sp3) bonds via regioselective coupling of C(sp2)−H/C(sp3)−H bonds is challenging due to the low reactivity and regioselectivity of C−H bonds. Here, a novel photoinduced Ru/photocatalyst-cocatalyzed regioselective cross-dehydrogenative coupling...
Herein,
we describe the copper-catalyzed arylalkylation of activated
alkenes via hydrogen-atom transfer and aryl migration strategy. The
reaction was carried out through a radical-mediated continuous migration
pathway using N-fluorosulfonamides as the alkyl source.
The primary, secondary, and tertiary alkyl radicals formed by intramolecular
hydrogen-atom transfer proceeded smoothly. This methodology is an
efficient approach for the synthesis of various amide derivatives
possessing a quaternary carbon center with good yields and high regioselectivity.
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