反应详情

温度

85 °C

A mixture of 2,4-dimethoxybenzonitrile (3.25 g, 20 mmol), hydroxylamine hydrochloride (2.92 g, 42 mmol) and K2CO3 (5.80 g, 42 mmol) in ethanol (80 mL) is stirred at 85° C. for 27 h before it is poured onto water (250 mL). The solution is acidified by adding 1 N aq. HCl (75 mL) and extracted once with DCM (100 mL). The aq. layer is basified with 1 N aq. NaOH (90 mL) and extracted three times with DCM (3×150 mL). The organic extracts are dried over MgSO4, the solvent is evaporated and the residue is dried under high vacuum to leave N-hydroxy-2,4-dimethoxy-benzamidine (1.35 g) as a beige solid. LC-MS: tR=0.68 min, [M+1]+=197.11.

1. additionis poured onto water (250 mL)
2. extractionextracted once with DCM (100 mL)
3. extractionextracted three times with DCM (3×150 mL)
4. dry with materialThe organic extracts are dried over MgSO4
5. customthe solvent is evaporated
6. customthe residue is dried under high vacuum