反应详情

温度

0 °C

A solution of N′-hydroxy-4-morpholin-4-yl-1,2,5-oxadiazole-3-carboximidamide (66 mg, 0.3 mmol) in 6.0 M HCl (0.62 mL) at 5-10° C. was treated with a solution of sodium nitrite (32 mg, 0.47 mmol) in water (0.5 mL) dropwise and stirred for 2 h at 0° C. The suspension was filtered and the solid washed with ice water to give desired product (22 mg, 30%). The filtrate was extracted with ethyl acetate (30 mL) which was washed with brine (10 mL), filtered and concentrated to give additional product (23 mg, 32%) that contained minor impurities. The combined material was used immediately in the next step.

1. filtrationThe suspension was filtered
2. washthe solid washed with ice water