反应详情

At 0° C., to a solution of boc-(4-aminomethyl)-benzoic acid (5.000 g, 19.9 mmol), NMM (2.214 g, 21.89 mmol) in anhydrous THF (50 mL) was added dropwise isobutyl chloroformate (2.853 g, 20.89 mmol). The resulting mixture was stirred for 10 min, then N-hydroxydodecanimidamide (Example 23, step a) (6.398 g, 29.85 mmol) was added at once. After 1 h the ice-water bath was removed and the mixture was stirred for 14 h at rt. An aqueous solution of HCl (1N, 50 mL) was added and the mixture was extracted with AcOEt (3×70 mL). The combined organic layers were washed with water (150 mL), dried over MgSO4 and evaporated to give a white solid (9.2 g). This crude product was purified by flash chromatography over silica gel (c-Hex/AcOEt 4/1) to give the title compound as a white solid (7.91 g, 89%). 1H NMR (CDCl3, 300 MHz) δ 7.80 (d, 2H, J=8.0 Hz), 7.50 (t, 1H, J=5.7 Hz) 7.32 (d, 2H, J=8.0 Hz), 6.42 (br s, 1H), 6.27 (br s, 1H), 4.20 (s, 1H), 4.18 (s, 1H), 1.91-2.15 (m, 2H), 1.08-1.66 (m, 27H), 0.86 (t, 3H, J=6.9 Hz). M+(LC/MS(ESI)): 448.4; M−(LC/MS(ESI)): 446.3. HPLC (Condition A), Rt: 5.74 min (HPLC purity: 96.7%).

1. customAfter 1 h the ice-water bath was removed
2. stirringthe mixture was stirred for 14 h at rt
3. additionAn aqueous solution of HCl (1N, 50 mL) was added
4. extractionthe mixture was extracted with AcOEt (3×70 mL)
5. washThe combined organic layers were washed with water (150 mL)
6. dry with materialdried over MgSO4
7. customevaporated