replacement in catalysis is especially interesting if different catalytic reactivity is observed. We report, here, on the selective manganese-catalyzed base-switchable synthesis of N-alkylated amines or imines. In both reactions, borrowing hydrogen/hydrogen autotransfer (N-alkyl amine formation) or dehydrogenative condensation (imineformation), we start from the same amines and alcohols and use the same
Distinctive reactivity of <i>N</i>-benzylidene-[1,1'-biphenyl]-2-amines under photoredox conditions
作者:Shrikant D Tambe、Kwan Hong Min、Naeem Iqbal、Eun Jin Cho
DOI:10.3762/bjoc.16.114
日期:——
A simple photocatalytic method was developed for the synthesis of unsymmetrical 1,2-diamines by the unprecedented reductive coupling of N-benzylidene-[1,1'-biphenyl]-2-amines with an aliphatic amine. The presence of a phenyl substituent in the aniline moiety of the substrate was critical for the reactivity. The reaction proceeded via radical–radical cross-coupling of α-amino radicals generated by proton-coupled
PhI(OAc)<sub>2</sub>–BF<sub>3</sub>–OEt<sub>2</sub>mediated domino imine activation, intramolecular C–C bond formation and β-elimination: new approach for the synthesis of fluorenones, xanthones and phenanthridines
作者:Satinath Sarkar、Narender Tadigoppula
DOI:10.1039/c4ra06159d
日期:——
PhI(OAc)2âBF3âOEt2 mediated domino synthesis of biologically important fluorenones, xanthones and phenanthridines has been developed. The reaction proceeds through imine activation, intramolecular CâC bond formation and β-elimination.
作者:W. Russell Bowman、Jessica E. Lyon、Gareth J. Pritchard
DOI:10.3998/ark.5550190.0013.714
日期:——
Two routes to phenanthridines are reported; a palladium-mediated route using imidoyl-selanides as precursors and a modified radicalroute using aryl imines as starting materials.
Photochemical Access to Substituted β-Lactams and β-Lactones via the Zimmerman–O’Connell–Griffin Rearrangement
作者:August Runemark、Mario Martos、Martin Nigríni、Francoise M. Amombo Noa、Lars Öhrström、Henrik Sundén
DOI:10.1021/acs.orglett.3c01990
日期:2023.7.28
A photomediated protocol giving facile access to substituted β-lactam and β-lactones is presented. The method realizes, for the first time, the use of the Zimmerman–O’Connell–Griffin (ZOG) rearrangement in [2 + 2] cycloaddition. Products are obtained in high yield with excellent diastereoselectivity under visible light irradiation and under mild reaction conditions.