564. Heterocyclic syntheses with malonyl chloride. Part VII. Dihydropyrano[3,4-e]-1,3-oxazines from isocyanates, and their degradation to dihydro-2,4-dioxo-1,3-oxazines and thence conversion into pyridones
作者:M. Aslam Butt、J. A. Elvidge、Arthur Brian Foster