반응 #554177

반응 방정식

2-nitro-4,5-dimethoxybenzonitrile

sodium dithionite

→

2-amino-4,5-dimethoxybenzonitrile

수율 97.2%

용매

water

반응 조건

후처리

1. 1
   workup.DISSOLUTIONwas dissolved completely
2. 2
   여과The resulting solution was filtered
3. 3
   온도cooled to room temperature
4. 4
   기타to get crystal
5. 5
   여과The solid was collected by filtration

실험 절차

A suspension of 2-nitro-4,5-dimethoxybenzonitrile (6.0 g, 28.8 mmol) in water (200 mL) was heated to 90° C. To this hot mixture was added sodium dithionite in a small portion until it was dissolved completely. The resulting solution was filtered and then cooled to room temperature to get crystal. The solid was collected by filtration to afford 4.99 g (97%) of 2-amino-4,5-dimethoxybenzonitrile. An analytical sample was recrystallized from acetonitrile. 1H NMR (100 MHz, DMSO-d6): δ3.64 (s, 3H, CH3), 3.73 (s, 3H, CH3), 4.32 (br s, 2H, NH2), 6.41 (s, 1H, Ar--H), 6.86 (s, 1H, Ar--H). 13C NMR (25 MHz, DMSO-d6): d 55.55, 56.87, 83.67, 92.08, 113.96, 140.33, 148.12, 154.33. MS: m/z 178 (M+), 163 (M+ -15), 147 (M+ -31), 135 (M+ -43), 120 (M+ -58).

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