[NH3:1].C([O:5][CH2:6][C:7]1[O:8][CH:9]=[C:10]([C:12]([O:14]C)=O)[N:11]=1)(=O)C>>[C:12]([C:10]1[N:11]=[C:7]([CH2:6][OH:5])[O:8][CH:9]=1)(=[O:14])[NH2:1]20 mL (352 mmol) of 28% aqueous ammonia are added to a round-bottomed flask containing 0.60 g (3.01 mmol) of methyl 2-acetoxymethyloxazole-4-carboxylate, prepared in step 5.1., and the reaction medium is then stirred at room temperature for 24 hours.
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