nBu4NI-catalyzed cross-coupling of benzyl and allylic compounds with N-hydroxyphthalimide for the synthesis of alkyloxyamines were realized for the first time.
Intramolecular cascade annulation triggered by rhodium(III)-catalyzed sequential C(sp<sup>2</sup>)–H activation and C(sp<sup>3</sup>)–H amination
作者:Liangliang Song、Guilong Tian、Johan Van der Eycken、Erik V Van der Eycken
DOI:10.3762/bjoc.15.52
日期:——
A rhodium(III)-catalyzed intramolecular oxidative annulation of O-substituted N-hydroxyacrylamides for the construction of indolizinones via sequential C(sp2)–H activation and C(sp3)–H amination has been developed. This approach shows excellent functional-group tolerance. The synthesized scaffold forms the core of many natural products with pharmacological relevance.
we report the synthesis of a series of O-alkyl oximes of flavone and 6-hydroxyflavone using a simple experimental protocol under solvent free conditions with yields up to 87%. Cytotoxicity of all compounds was evaluated against MDA-MB-231, PC-3, A-549 and MRC-5 cells. IC50 values for two compounds were determined to be in the range 28.7-47.8 μM against all tested cell lines. Oximeethers derivatives
polyhydroxylated azepanes. Polyheterocyclic scaffolds were prepared by intramolecular aza-[4+3] cycloadditionreactions of aza-oxyallylic cations with cyclic dienes. The aza-oxyallylic cation was generated in situ by the dehydrohalogenation of α-halohydroxamates. The highly functionalized heterocyclic products undergo a variety of reactions that provide useful scaffolds for target-directed synthesis, including
Benzylic C–H heteroarylation of <i>N</i>-(benzyloxy)phthalimides with cyanopyridines enabled by photoredox 1,2-hydrogen atom transfer
作者:Long-Jin Zhong、Hong-Yu Wang、Xuan-Hui Ouyang、Jin-Heng Li、De-Lie An
DOI:10.1039/d0cc03619f
日期:——
A visible light initiated α-C(sp3)–H arylation of N-(benzyloxy)phthalimides with cyanopyridines for the construction of highly valuable pyridinyl-containing diarylmethanols, including bioactive motif-based analogues, is reported. This method enables arylation of the C(sp3)–H bonds adjacent to an oxygen atom through alkoxy radical formation by O–N bond cleavage, 1,2-hydrogen atom transfer (HAT), arylation