1-Alkyl-3-phenyl-1,3-benzazaphospholine oxides are efficiently prepared by Paraham-type anionic cyclisation of ortho-lithiated N-alkyl-N-diphenylphosphionylmethylaniline derivatives obtained by sequential treatment of the parent brominated compounds with methyllithium and tert-butyllithium.
A. Couture, E. Deniau and P. Grandclaudon, J. Chem. Soc., Chem. Commun., 1994, 1329 DOI: 10.1039/C39940001329
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