Synthesen von Heterocyclen, 59.Mitt.: �ber 1,3-Oxazinone

Reaction of Phenylmalonyl Dichloride with 3-Phenylpropynamide and Transformations of the Product by the Action of Some Nucleophiles

“…In the1 H NMR spectrum we observed signals from aromatic protons (d 7.3637.73 ppm) and proton of the hydroxy group on C 4 (d 13.40 ppm). Crystalline oxazine III displayed in the IR spectrum absorption bands at 1750 [n(C=O)], 1600 [n(C=C)], 1540 [n(C=N)], and 2210 cm !1 [n(C=C)].…”