Fe(II)/Au(I) Relay Catalyzed Propargylisoxazole to Pyridine Isomerization: Access to 6-Halonicotinates
作者:Alexey V. Galenko、Firuza M. Shakirova、Ekaterina E. Galenko、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1021/acs.joc.7b00736
日期:2017.5.19
An efficient synthesis of methyl nicotinates/6-halonicotinates by the domino isomerization of 4-propargyl/(3-halopropargyl)-5-methoxyisoxazoles under Fe(II)/Au(I) relay catalysis was developed. It was found that FeNTf2 is an effective catalyst for first step of the domino isomerization, transformation of isoxazole to 2H-azirine, which is compatible with Ph3PAuNTf2, catalyzing the second step.
An iodoxybenzoic acid-mediated selected oxidative cyclization of N-hydroxyalkyl enamines was developed. Through this strategy, a variety of 2,3-disubstituted pyrroles and pyridines were produced in good selectivity involving oxidation of alcohol, followed by condensation of aldehyde and α-C of enamines. Furthermore, this metal-free method has several advantages, including the use of environmentally
Palladium-Catalyzed Cross-Coupling Reaction of Functionalized Aryl- and Heteroarylbismuthanes with 2-Halo(or 2-Triflyl)azines and -diazines
作者:Pauline Petiot、Alexandre Gagnon
DOI:10.1002/ejoc.201300850
日期:2013.8
The palladium-catalyzedcross-coupling of highly functionalized organobismuthanes with 2-halo(or 2-triflyl)pyridines, -pyrimidines, -pyrazines, and -pyridazines is reported. The reaction tolerates numerous functional groups, including aldehydes. The synthesis of a shelf-stable (formylphenyl)bismuth reagent and its use in a cross-couplingreaction is also described.