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Novel N-thiazolo-1,3-oxathiol-2-imines are synthesized by reaction of a-haloketones with potassium thiocyanate-silica gel. It is thought that the reaction occurs through conversion of the a-haloketone into the corresponding thiocyanate which then undergoes acid-catalyzed intramolecular cyclization to yield a cationic intermediate. Subsequent reaction of this intermediate with another molecule of the a-thiocyanatoketone and a second cyclization then gives the N-thiazolo-1,3-oxathiol-2-imine.

ureas. -(AOYAMA*, T.; MURATA, S.; ARAI, I.; ARAKI, N.; TAKIDO, T.; SUZUKI, Y.; KODOMARI, M.; Tetrahedron 62 (2006) 14, 3201-3213; Dep. Mater. Appl. Chem., Coll. Sci. Technol., Nihon Univ., Chiyoda, Tokyo 101, Japan; Eng.) -Jannicke 30-138

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