反应详情

To (S)-2-[2-(benzo[1,2,5]thiadiazole-4-sulfonylamino)-4-iodo-benzoylamino]-3-(3,4-dichloro-phenyl)-propionic acid methyl ester (55 mg, 0.079 mmol) in 2:1 water/THF (3 mL) was added LiOH-2H2O (7 mg, 0.158 mmol). The yellow solution was stirred for 2 h and then 20% aq. HCl (2 mL) was added. The mixture was extracted with EtOAc (3×). The organic layers were combined, dried (MgSO4), and concentrated to provide the desired product as a white solid (41 mg, 76%). HPLC: RT=9.77 min. MS (ESI−): mass calcd. for C22H15Cl2IN4O5S2, 677.3; m/z found, 676 [M−H]−. 1H NMR (400 MHz, CDCl3): 11.22 (s, 1H), 8.33 (d, J=7.0, 1H), 8.12 (d, J=8.8, 1H), 7.98 (d, J=0.8, 1H), 7.70 (dd, J=8.6, 7.3, 1H), 7.33 (d, J=8.2, 1H), 7.22 (d, J=8.2, 1H), 7.02 (dd, J=8.2, 1.6, 1H), 6.93 (d, J=8.3, 1H), 6.73 (d, J=7.3, 1H), 4.99 (q, J=6.3, 1H), 3.31 (dd, J=14.2, 5.7, 1H), 3.20 (dd, J=14.2, 5.7).

1. extractionThe mixture was extracted with EtOAc (3×)
2. dry with materialdried (MgSO4)
3. concentrationconcentrated