Answers are grounded in this paper and cite their sources.
[figure: see text] Stabilized ketone, aldehyde, and ester enolates react with vinamidinium hexafluorophosphate salts and hydroxylamine hydrochloride to give access to the corresponding pyridine N-oxides. The annulation reactions proceed in good to excellent yields with vinamidinium salts with a range of beta-substituents (R3 = halo, aryl, nitro, trifluoromethyl).
No takes yet. Share an insight, caveat, or question.
Davies et al. (2000) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: