반응 #640616

반응 방정식

5-Bromo-3-methoxy-pyrazin-2-ylamine

phenyl boronic acid

Na2CO3

→

product B

수율 82.0%

3-Methoxy-5-phenyl-pyrazin-2-ylamine

수율 82.0%

용매

EtOAc

toluene

ethanol

반응 조건

후처리

1. 1
   온도The reaction mixture was cooled to room temperature
2. 2
   세척The solution was washed with brine (2×5 mL)
3. 3
   건조The organic extracts was dried with MgSO4
4. 4
   기타solvent was removed under vacuum
5. 5
   기타The residue was purified with flash column

실험 절차

5-Bromo-3-methoxy-pyrazin-2-ylamine (A) (816 mg, 4 mmol) and phenyl boronic acid (732 mg, 6 mmol) in toluene (5 mL), ethanol (5 mL) and Na2CO3 (8 mmol, 1 M aqueous) was purged with nitrogen for 10 minutes, and was added PdCl2(PPh3)2(140 mg, 0.2 mmol). The reaction mixture was stirred at 85° C. for 4 hours. The reaction mixture was cooled to room temperature and diluted with EtOAc (50 mL). The solution was washed with brine (2×5 mL). The organic extracts was dried with MgSO4, then solvent was removed under vacuum. The residue was purified with flash column to give product B (660 mg, 82%) as yellow solid. 1H NMR (400 MHz, CDCl3): δ 8.08 (1H, s), 7.92 (2H, d), 7.46 (3H, m), 4.94 (2H, bs), 4.12 (3H, s); MS: 202 (M+H+).

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