Imidazolines are prepared by treatment of allylic O-methyl isoureas with phenylseleneyl chloride in the presence of silica gel; when the organoselenium-mediated cyclisation is performed with phenylselenenyl trifluoromethanesulphonate and trifluoromethanesulphonic acid 5,6-dihydro-1,3-oxazines are obtained.
R. Freire, E. L. León, J. A. Salazar and E. Suárez, J. Chem. Soc., Chem. Commun., 1989, 452 DOI: 10.1039/C39890000452
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