[CH2:1]([O:3][C:4]([C:6]1[N:7]=[C:8]([NH2:11])[O:9][CH:10]=1)=[O:5])[CH3:2].[C:12](OC(=O)C)(=[O:14])[CH3:13]>>[CH2:1]([O:3][C:4]([C:6]1[N:7]=[C:8]([NH:11][C:12](=[O:14])[CH3:13])[O:9][CH:10]=1)=[O:5])[CH3:2]1.0 g (6.40 mmol) 2-Amino-oxazole-4-carboxylic acid ethyl ester and 9.1 mL (96.3 mmol) acetic acid anhydride are stirred for 2 d at rt. The mixture is concentrated in vacuo to yield the desired product which is used without further purification.
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