反应详情

3-(4-(1-(2,2-Dimethyl-1,3-dioxolan-4(S)-ylcarbonyl)-1,2,5,6-tetrahydropyrid-4-yl)-3,5-difluorophenyl)-5(R)-(N-(t-butoxycarbonyl)-3-methylisoxazol-5-ylaminomethyl)oxazolidin-2-one (400 mg, 0.65 mM) was dissolved in dichloromethane (6 ml) and treated with trifluoroacetic acid (6 ml) at 0°. After stirring for 30 minutes at ambient temperature, water (1.2 ml) was added, and stirring continued for 1 hour. Solvent was removed, the residue dissolved in methanol (20 ml), and treated with aqueous ammonia to bring the pH to 7-8; solvent was removed, and the residue chromatographed on a 10 g silica Mega Bond Elut® column, eluting with a gradient increasing in polarity from 0 to 5% methanol in dichloromethane. Relevant fractions were combined and evaporated to give the desired product (181 mg ). NMR (DMSO-d6) δ: 2.02 (s, 3H); 2.29 (m, 1H); 2.35 (m, 1H); 3.41 (t, 2H); 3.47 (m, 1H); 3.54 (m, 1H); 3.71 (m, 1H); 3.75 (dd, 1H); 4.04 (dd, 1H); 4.08 (m, 1H); 4.13 (t, 1H); 4.24 (m, 1H); 4.36 (t, 1H); 4.66 (t, 1H); 4.82 (m, 1H); 4.95 (t, 1H); 4.99 (s, 1H); 5.85 (s, 1H); 7.30 (d, 2H); 7.36 (t, 1H). MS (ESP): 479 (MH+) for C22H24F2N4O6

1. stirringstirring
2. waitcontinued for 1 hour
3. customSolvent was removed
4. dissolutionthe residue dissolved in methanol (20 ml)
5. additiontreated with aqueous ammonia
6. customsolvent was removed
7. customthe residue chromatographed on a 10 g silica Mega Bond Elut® column
8. washeluting with
9. temperaturea gradient increasing in polarity from 0 to 5% methanol in dichloromethane
10. customevaporated