Protonated heteroaromatic bases react with formamide, N,N-dimethylformamide, cyclic ethers, and methanol in the presence of hydroxylamine-O-sulphonic acid and catalytic amounts of an iron(II) salt to afford selective substitution by a redox chain process.
A. Citterio, A. Gentile, F. Minisci, M. Serravalle and S. Ventura, J. Chem. Soc., Chem. Commun., 1983, 916 DOI: 10.1039/C39830000916
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