A new, general approach for the synthesis of heteroannulated 3,1-oxazin-4-ones

Article abstract of DOI:10.1016/S0040-4020(01)86261-X

β-(N-Triphenylphosphoranyliden)-enamino esters afford the synthetically useful heteroannulated 3,1-oxazin-4-ones with aroyl chlorides in different solvents. The reaction proceeds in one step and in high yields and appears to be independent of the reactivity of the heterocyclic substrate.