Addition of diazonium tetrafluoroborates to an acyl chloride pyridine mixture affords hydrazonoacid derivatives in smooth conditions; this new Japp–Klingemann reaction emphasizes the synthetic potential of electrophilic addition to ketenes.
New versatile approach to α-hydrazonoesters and amino acid derivatives trough a modified Japp–Klingemann reaction
V. Atlan, L. E. Kaim and C. Supiot, Chem. Commun., 2000, 1385 DOI: 10.1039/B003361H
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