反应详情

To a stirred solution of 4-hydroxypiperidine-1-carbonitrile (0.4 g, 3.1 mmol) in THF (10 mL), (E)-N′-hydroxyisobutyrimidamide (0.35 g, 35 mmol) and ZnCl2 (1M solution in THF) (4.7 mL) were added and stirred at room temperature for 10 h. The reaction mixture was concentrated in vacuo and the resulting crude was dissolved in 4N HCl in ethanol-water (1:1) and stirred at 60-70° C. for 2-3 h. The reaction was quenched by saturated NaHCO3 and the organic layer was separated and concentrated. The residue on column chromatography gave the title compound. (0.280 g, 41.8%)

1. concentrationThe reaction mixture was concentrated in vacuo
2. dissolutionthe resulting crude was dissolved in 4N HCl in ethanol-water (1:1)
3. stirringstirred at 60-70° C. for 2-3 h
4. customThe reaction was quenched by saturated NaHCO3
5. customthe organic layer was separated
6. concentrationconcentrated