[CH3:1][O:2][C:3]([CH2:5][NH:6][C:7]1[C:8](=[CH:13][CH:14]=[CH:15][CH:16]=1)[C:9]([O:11]C)=O)=[O:4].[O-:17][C:18]#[N:19].[K+]>C(O)(=O)C>[O:17]=[C:18]1[NH:19][C:9](=[O:11])[C:8]2[C:7](=[CH:16][CH:15]=[CH:14][CH:13]=2)[N:6]1[CH2:5][C:3]([O:2][CH3:1])=[O:4]Monatsh. Chem. (1987) 118; pages 71-79 describes the reaction of methyl N-(methoxycarbonylmethyl)anthranilate with potassium cyanate in glacial acetic acid to give methyl 1,2,3,4-tetrahydro-2,4-dioxoquinazolin-1-ylacetate. Although 10 equivalents of potassium cyanate are employed, the yield is only 19%.
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