Hydrazine → 5-((tert-butyldiphenylsilyloxy)methyl)-6-((2R,6S)-2,6-dimethylmorpholino)-7-fluorobenzo[d]isoxazole-3-carbohydrazide

Participants

Reaction Steps

Ethyl 5-((tert-butyldiphenylsilyloxy)methyl)-6-((2R,6S)-2,6-dimethylmorpholino)-7-fluorobenzo[d]isoxazole-3-carboxylate (Intermediate 204, 0.5 g, 0.85 mmol) in 4.5 ml ethanol was treated with anhydrous hydrazine (0.490 ml, 15.60 mmol) at room temperature for 2 hour. Reaction was diluted with dichloromethane and brine. Organic layer washed with water, dried over sodium sulfate, and concentrated. The residue purified on silica-gel column (elution 40% etoac in hexanes) to give 5-((tert-butyldiphenylsilyloxy)methyl)-6-((2R,6S)-2,6-dimethylmorpholino)-7-fluorobenzo[d]isoxazole-3-carbohydrazide (0.354 g, 72.5%).

Provenance & Evidence