Heterocyclic β-enamino esters; 55. Imidazo[4,5-d]-, thiazolo[5,4-d]-, and thiazolo[4,5-d][1,3]oxazinones

Article abstract of DOI:10.1055/s-1993-25810

5-Aroylamine-, 3a,b, and 5-(3-arylureido)-1-benzyl-1H-imidazole-4-carboxylates 6a,b are converted with dichlorotriphenylphosphorane into 3-benzyl-3,7-dihydro-imidazo[4,5-d][1,3]oxazin-7-ones 4a,b and 7a,b, respectively. Similarly, 5-aroylamino-4-thiazolec