反应详情

To a suspension of N-methyl pipecolinic acid (0.15 mmole, 21 mg) in dichlbromethane (5 mL) were subsequently added, in the order, HOAt (0.11 mmole, 15 mg), HATU (0.11 mmole, 42 mg) and Et3N (0.21 mmole, 29 μL). After stirring for 5 minutes, a solution in dichloromethane (1 mL) of the compound obtained in example 15.3 (0.1 mmole, 46 mg) was added. The reaction mixture was stirred for 4 hours, At the end dichloromethane was removed under vacuum. The crude product was dissolved in ethyl acetate (10 mL) and washed, in the order, with a NaHCO3 saturated aqueous solution (1×10 mL) and with brine (1×10 mL). The organic phase were dried over Na2SO4, filtered and concentrated under vacuum. The product was purified by flash chromatography (eluent chloroform:methanol 97:3 volume/volume). 58 mg (99% yield) of pure 2-((1R,3R)-3-((2S,3S)-2-azido-N-(2-methoxyethyl)-3-methylpentanamido)-1-hydroxy-4-methylpentyl)-N-methylthiazole-4-carboxamide were isolated. Rf=0.37 (chloroform/methanol 97:3 volume/volume). 1HNMR (400 MHz, CDCl3) δ: 8.07 (s, 1H), 7.62 (m, 1H), 7.57 (m, 1H), 5.75 (dd, 1H), 4.61 (dd, 1H), 4.11 (m, 1H), 3.70-3.48 (m, 4H), 3.22 (s, 3H), 3, 20-3.08 (m, 1H), 2.92 (m, 3H), 2.88-2.78 (m, 1H), 2.40 (m, 1H), 2.2-2.09 (m, 6H), 2.09-1.81 (m, 5H), 1.69-1.48 (m, 5H), 1.39-1.30 (m, 1H), 1.26-1.09 (m, 1H), 1.08-0.86 (m, 12H).

1. customwas removed under vacuum
2. dissolutionThe crude product was dissolved in ethyl acetate (10 mL)
3. washwashed, in the order, with a NaHCO3 saturated aqueous solution (1×10 mL) and with brine (1×10 mL)
4. dry with materialThe organic phase were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customThe product was purified by flash chromatography (eluent chloroform:methanol 97:3 volume/volume)