反应详情

4-[4-(azetidin-3-ylmethoxy)phenyl]tetrahydro-2H-pyran-4-carbonitrile (0.29, 0.73 mmol) was dissolved in THF (2 mL). Cyclobutanone (0.06 mL, 0.80 mmol) and acetic acid (0.042 mL, 0.73 mmol) were added. The mixture was stirred at room temperature for 30 minutes. Sodium triacetoxyborohydride (0.311 g, 1.47 mmol) was added. The mixture was stirred at room temperature for 18 hours. The reaction mixture was diluted with 10% aqueous sodium carbonate (5 mL) then extracted with DCM (2×50 mL). The organics were combined, dried over sodium sulphate, filtered and concentrated in vacuo to provide a clear oil. This was purified by flash chromatography on silica gel eluting with dichloromethane:methanol:ammonia (96:4:0.4 to 95:5:0.5) to provide the title compound (0.194 g, 81%) as a clear oil. 1H NMR (400 MHz, CDCl3) δ 1.60-1.70 (m, 2H), 1.70-1.80 (m, 2H), 1.80-1.90 (m, 2H), 1.95-2.00 (m, 2H), 2.0-2.15 (m, 2H), 2.9 (m, 1H), 3.1 (t, 2H), 3.16 (m, 1H), 3.4 (t, 2H), 3.9 (m, 2H), 4.10 (m, 4H), 6.90 (d, 2H), 7.40 (d, 2H). HRMS ESI+ m/z 327.2059 [MH]+.

1. stirringThe mixture was stirred at room temperature for 18 hours
2. extractionthen extracted with DCM (2×50 mL)
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto provide a clear oil
7. customThis was purified by flash chromatography on silica gel eluting with dichloromethane:methanol:ammonia (96:4:0.4 to 95:5:0.5)