Cl.[O:2]1[CH:6]=[CH:5][CH:4]=[C:3]1[C:7]([CH2:9][NH2:10])=[O:8].C(=O)(O)[O-].[Na+].[C:16](Cl)(=[O:20])[CH:17]([CH3:19])[CH3:18]>>[C:16]([NH:10][CH2:9][C:7]([C:3]1[O:2][CH:6]=[CH:5][CH:4]=1)=[O:8])(=[O:20])[CH:17]([CH3:19])[CH3:18]16.0 g of (2-furylcarbonyl)methylamine hydrochloride, 20.5 g of sodium bicarbonate and 11.4 g of isobutyryl chloride are treated in the same manner as described in Preparation 1-(1). 13.0 g of N-isobutyryl-(2-furylcarbonyl)methylamine are thereby obtained. Yield: 67.0%
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