反应详情

To a solution of tert-butyl 4-(6-((1S,45)-4-(benzoyloxy)-3-oxocyclohexyl)-3-(bis(tert-butoxycarbonyl)amino)pyrazin-2-yl)-2-fluorobenzoate (730 mg, 1.034 mmol) in DCM (7 mL) at RT was added XtalFlour-E (939 mg, 4.14 mmol) followed by triethylamine trihydrofluoride (0.674 mL, 4.14 mmol). The resultant mixture was stirred at RT for 5 hours. The mixture was filtered and the filtered solution was directly applied for ISCO separation: 24 g silica gel, 0 to 70% EtOAc in Heptane, 30 min. A light yellow solid (670 mg, 0.902 mmol, 87% yield) was obtained. LC-MS (m/z): (MH+) 728.0 at 0.95 min (non-polar MS method). 1H NMR (400 MHz, CDCl3) δ ppm 0.88 (s, 2H) 1.19-1.39 (m, 21H) 1.48-1.68 (m, 11H) 1.86-2.08 (m, 2H) 2.08-2.21 (m, 1H) 2.26-2.47 (m, 2H) 2.47-2.63 (m, 1H) 3.21-3.44 (m, 1H) 5.22-5.51 (m, 1H) 7.41-7.55 (m, 4H) 7.60 (s, 1H) 7.96 (d, J=7.82 Hz, 1H) 8.06-8.19 (m, 2H) 8.42 (s, 1H).

1. filtrationThe mixture was filtered
2. customthe filtered solution was directly applied for ISCO separation
3. custom24 g silica gel, 0 to 70% EtOAc in Heptane, 30 min