反应详情

A stock solution of Example 23e (0.164 M in N,N-dimethylacetamide, 255 mL, 0.042 mmol), acetic acid (4 M in methanol, 200 mL, 0.84 mmol), sodium cyanoborohydride (0.31 M in methanol, 200 mL, 0.063 mmol) and 1-ethyl-1H-pyrazole-3-carbaldehyde (0.40 M in N,N-dimethylacetamide, 156 mL, 0.063 mmol) were aspirated from their respective source vials, mixed through a perfluoroalkoxy mixing tube (0.2 mm inner diameter), and loaded into an injection loop. The reaction segment was injected into the flow reactor (Hastelloy coil, 0.75 mm inner diameter, 1.8 mL internal volume) set at 50° C., and passed through the reactor at 180 μL, min−1 (10 minute residence time). Upon exiting the reactor, the reaction mixture was loaded directly into an injection loop and purified by reverse phase HPLC(C8, acetonitrile/water (0.1% ammonium acetate), 5-100%) to give 0.0081 g (41%) of the title compound. 1H NMR (400 MHz, DMSO-d6/D2O) δ 7.57 (m, 2H), 7.07 (d, J=2.75 Hz, 1H), 6.95 (m, 2H), 6.74 (m, 2H), 6.60 (dd, J=8.54, 2.75 Hz, 1H), 6.46 (m, 2H), 6.22 (d, J=2.14 Hz, 1H), 4.28 (s, 2H), 4.10 (q, J=7.12 Hz, 2H), 4.04 (s, 3H), 2.88 (d, J=53.41 Hz, 2H), 1.38 (m, 3H). MS (APCI+) m/z 469.1 (M+H)+.

1. additionmixed through a perfluoroalkoxy mixing tube (0.2 mm inner diameter)
2. customset at 50° C.
3. custompassed through the reactor at 180 μL, min−1 (10 minute residence time)
4. custompurified by reverse phase HPLC(C8, acetonitrile/water (0.1% ammonium acetate), 5-100%)