Abstract
The behaviour of mesoionic 5H,7H-thiazolo [3,4-c] oxazol-1-ones ( α) towards imines ( 2) and ( 3) was studied. The cycloaddition reaction affords 7-thia-2,5-diazaspiro [3,4] octan-1-one ( 4–7) and lH,3H-imidazo [1,5-c] thiazole ( 8) derivatives. The possible mechanism involved in the formation of products as well as the unusual rearrangement showed by spirocyclic β-lactams ( 6,7) are discussed.
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