反应详情

A solution of 3-(2-tert-Butoxycarbonyl-ethylsulfamoyl)-benzoic acid methyl ester (step 1) (5.0 g, 14.56 mmol) and lithium iodide (2.53 g, 18.93 mmol) in pyridine (60 ml) was heated at reflux for 16 h. The reaction mixture was concentrated in vacuo, diluted with DCM (60 ml) and poured into 1.5N HCl (60 ml). The aqueous phase was separated and extracted with DCM (6×60 ml). The combined organic extracts were dried (MgSO4) and concentrated in vacuo. The crude residue was purified using an Isolute® PE-AX 10 g cartridge (anion exchange column), eluting with MeOH (200 ml) and then a 1:1 mixture of MeOH/AcOH (200 ml) to afford the title compound as white crystals; 1H NMR (400 MHz, CDCl3) δ 8.63 (1H, s), 8.32 (1H, d), 8.14 (1H, d), 7.68 (1H, t), 5.63 (1H, t), 3.22 (2H, m), 2.51 (2H, t), 1.43 (9H, s).

1. temperatureat reflux for 16 h
2. concentrationThe reaction mixture was concentrated in vacuo
3. additiondiluted with DCM (60 ml)
4. additionpoured into 1.5N HCl (60 ml)
5. customThe aqueous phase was separated
6. extractionextracted with DCM (6×60 ml)
7. dry with materialThe combined organic extracts were dried (MgSO4)
8. concentrationconcentrated in vacuo
9. customThe crude residue was purified
10. washeluting with MeOH (200 ml)
11. additiona 1:1 mixture of MeOH/AcOH (200 ml)