反应详情

(The following reaction is done in an anhydrous N2 atmosphere.) Suspend EDCHCl (138 mg, 0.72 mmol) and Et3N (101 μL, 0.72) in anhydrous DCM (4.5 mL) and stir the resulting solution for 5 min at rt. Add 2-(3,4,5-Trimethoxy-phenyl)-acetic acid (163 mg, 0.72 mmol) and DMAP (8 mg, 0.07 mmol) and stir the resulting solution for 10 min. Add 5-(4-Amino-2-nitro-phenyl)-2-methyl-furan-3-carboxylic acid methyl ester (58) (100 mg, 0.36 mmol) and stir the reaction solution for 22 h at rt. Quench reaction solution with sat. aqu. NH4Cl and water, separate layers and extract aqu. layer with DCM (3 times). Wash the combined organic layer with water and brine and dry with Na2SO4. Purify the crude product by preparative radial chromatography (silica gel, EtOAc/CyH 1+1) to obtain 2-Methyl-5-{2-nitro-4-[2-(3,4,5-trimethoxy-phenyl)-acetylamino]-phenyl}-furan-3-carboxylic acid methyl ester (59) (96 mg, 55%) as an yellow solid. 1H NMR (400 MHz, CDCl3): 2.55 (s, 3H); 3.65 (s, 2H); 3.79 (s, 3H); 3.81 (s, 6H); 3.82 (s, 3H); 6.50 (s, 2H); 6.77 (s, 1H); 7.53 (d, 1H, J=8.6 Hz); 7.66 (dd, 1H, J1=8.6 Hz, J2=2.0 Hz); 7.93 (br.s, 1 H); 7.96 (d, 1H, J=2.0 Hz).

1. custom(The following reaction
2. customQuench
3. customreaction solution with sat. aqu
4. customNH4Cl and water, separate layers
5. extractionextract aqu
6. washWash the combined organic layer with water and brine
7. dry with materialdry with Na2SO4
8. customPurify the crude product by preparative radial chromatography (silica gel, EtOAc/CyH 1+1)