Selective alkylation of indazoles is still a highly challenging topic in chemistry and synthesis of important molecules. Herein, a novel highly selective N2-alkylation of indazoles with diazo compounds is described...

We have developed a novel TfOH-catalyzed regioselective O-alkylation of 2-pyridones with diazo compounds in high regioselectivity. This protocol is characterized by mild reaction conditions, metal-free, and simplicity.

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Correction for ‘Regioselective O-alkylation of 2-pyridones by TfOH-catalyzed carbenoid insertion’ by Zhewei Yan et al., Chem. Commun., 2023, 59, 106–109, https://doi.org/10.1039/d2cc05676c.

A novel Brønsted acid catalyzed three-component reaction of diazo compounds has been achieved from α-diazo ester, N-aminophthalimide and a solvent.