反应详情

温度

0 °C

(The following reaction is done in an anhydrous N2 atmosphere.) Add a solution of 2′,3′,4′-trimethoxy-biphenyl-3-carbonyl chloride (35) (345 mg, 1.13 mmol) in dichloromethane (5 mL) to an ice cooled solution of 2-bromo-5-nitro-phenylamine (88) (232 mg, 1.07 mmol) in anhydrous dichloromethane (12 mL) and anhydrous pyridine (2.9 mL). Stir the reaction mixture for 15 min at 0° C. and additional 17 h at rt. Pour the reaction mixture into ice cooled 1M aqu. HCl (to get pH ca. 3), extract with EtOAc (3×), wash the combined organic layer with brine and dry it with Na2SO4 to afford crude 2′,3′,4′-trimethoxy-biphenyl-3-carboxylic acid (2-bromo-5-nitro-phenyl)-amide (89) as a beige solid (542 mg, quant.). NMR (400 MHz, CDCl3): 3.72 (s, 3H); 3.91 (s, 3H); 3.93 (s, 3H); 6.77 (d, 1H, J=8.6 Hz); 7.08 (d, 1H, J=8.6 Hz); 7.56 (t, 1H, J=8.8 Hz); 7.75 (d, 2H, J=8.8 Hz); 7.86 (d, 1H, J=8.8 Hz), 7.87 (d, 1H, J=8.8 Hz); 8.09 (t, 1H, J=1.7 Hz); 8.61 (br. s, 1H); 9.59 (d, 1H, J=2.5 Hz).

1. custom(The following reaction
2. customadditional 17 h
3. customat rt
4. additionPour the reaction mixture into ice
5. temperaturecooled 1M aqu
6. extractionHCl (to get pH ca. 3), extract with EtOAc (3×)
7. washwash the combined organic layer with brine
8. dry with materialdry it with Na2SO4