反应详情

温度

70 °C

To a stirred solution of methyl 3-chloro-2-hydroxypyridine-5-carboxylate (300 mg, 1.599 mmol), N-tert-butoxycarbonylprolinol (321.9 mg, 1.599 mmol), and Ph3P (503 mg, 1.919 mmol) in THF (3 mL) was slowly added DIAD (378 μl, 1.919 mmol) at room temp, and the mixture was stirred for 13 hr at 70° C. The mixture was concentrated and the residue was chromatographed on silica-gel with n-hexane-EtOAc (3:1, v/v) as eluent to give 235.6 mg (40%) methyl 3-chloro-2-[[1-(tert-butoxycarbonyl)-2-pyrrolidinyl]methoxy]pyridine-5-carboxylate as a pale yellowish oil. 1H-NMR (400 MHz, CDCl3) δ1.46 (s, 9H), 1.87 (m, 1H), 2.05 (br s, 3H), 3.43 (br s, 2H), 3.92 (s, 3H), 4.17, 4.26 (br s each, 1H), 4.45-4.51 (m, 1H), 4.50 (s, 1H), 8.21 (s, 1H), (s, 1H), 8.67 (d, J=2.0 Hz, 1H); MS (FAB) m/z 371 (M++1).

1. customat room temp
2. concentrationThe mixture was concentrated
3. customthe residue was chromatographed on silica-gel with n-hexane-EtOAc (3:1