反应详情

Pyrazin-2-yl-hydrazine 23a (1 g, 9 mmol) was added in an eggplant-shaped bottle (25 mL), followed by dropwise addition of difluoroacetic anhydride (4 g, 22.98 mmol) at 0° C. After stirring at room temperature for 3 hours, the reaction mixture was concentrated under reduced pressure to obtain crude 2,2-difluoro-N′-pyrazin-2-yl-acetohydrazide difluoroacetate 23b (2 g) as a brown oil. The product was used directly in the next reaction without purification.

1. concentrationthe reaction mixture was concentrated under reduced pressure