The reaction of allylic ureas with phenylselenenyl chloride in the presence of silica gel affords 2-oxazolines in good to excellent yields; 2-oxazolines are also stereospecifically obtained from β-phenylseleno ureas by chemoselective alkylation of the selenium atom followed by basic treatment.
C. Betancor, E. I. León, T. Prange, J. A. Salazar and E. Suárez, J. Chem. Soc., Chem. Commun., 1989, 450 DOI: 10.1039/C39890000450
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