反应详情

A stirred solution of acid 8 (1.95 g, 4.00 mmol) and amine 14 (1.04 g, 4.00 mmol) in CH2Cl2 (60 mL) was charged with NMM (2.64 mL, 24.0 mmol) and EEDQ (1.97 g, 8.00 mmol). The resulting mixture was stirred at room temperature for 16 h. Water (20 mL) was added to the reaction mixture and extracted with CH2Cl2 (3×50 mL). The combined organic extract was washed with brine and dried over Na2SO4. The solvent was removed and the residue was purified by column chromatography (silica gel, 20% to 40% EtOAc in hexanes) to afford amide 15 (2.15 g, 73% over two steps) as a white solid: 1H NMR (400 MHz, CD3OD) δ 4.10-4.02 (m, 1H), 4.01-3.92 (m, 1H), 3.70 (s, 3H), 3.35 (t, J=6.8 Hz, 2H), 3.24-3.10 (m, 2H), 1.83-1.67 (m, 2H), 1.66-1.55 (m, 4H), 1.52 (s, 9H), 1.46 (s, 9H), 1.45-1.35 (m, 6H), 1.438 (s, 9H), 1.431 (s, 9H).

1. extractionextracted with CH2Cl2 (3×50 mL)
2. extractionThe combined organic extract
3. washwas washed with brine
4. dry with materialdried over Na2SO4
5. customThe solvent was removed
6. customthe residue was purified by column chromatography (silica gel, 20% to 40% EtOAc in hexanes)