反应详情

To a solution of N2-cyclopropylpyrazine-2,3-diamine (0.6690 g, 4.45 mmol) in THF (22.27 ml) at 50° C. was added CDI (2.89 g, 17.82 mmol, Fluka). The reaction was allowed to stir for 1½ h. The reaction flask was place in an ice bath until the temperature reached 0° C. The flask was raised and water (5 mL) was added dropwise to quench. (Note: if exothermic reaction was detected then flask was placed back into ice bath until it stopped.) The crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage SNAP HP-silica gel column (50 g), eluting with a gradient of 1% to 8% MeOH in CH2Cl2, to provide 1 the title compound (0.5578 g, 3.17 mmol, 71.1% yield). LCMS showed product peak at 0.999 min (m+1=177.1). 1H NMR (400 MHz, DMSO-d6) δ ppm 0.95-1.07 (m, 4 H) 2.87-3.00 (m, 1 H) 7.84-7.89 (m, 1 H) 7.89-7.94 (m, 1 H) 11.87 (s, 1 H)

1. customreached 0° C
2. temperatureThe flask was raised
3. customto quench
4. custom(Note: if exothermic reaction
5. customflask was placed back into ice bath until it
6. customchromatographed through a Biotage SNAP HP-silica gel column (50 g)
7. washeluting with a gradient of 1% to 8% MeOH in CH2Cl2