1-Bromopropane → HCID 10725518, compound

Temperature

80 °C

3-Amino-4-pyrazolecarbonitrile 1 (Acros, 3.24 g, 30.0 mmol), propylbromide (Acros, 4.43 g, 36 mmol) and anhydrous potassium carbonate (Fisher, 5.0 g, 36 mmol) were suspended in 20 mL anhydrous DMF and heated at 80° C. in a sealed tube under argon overnight. The reaction was permitted to cool and the DMF was removed on a rotary evaporator. Water was added (100 mL) and the organics were extracted with dichloromethane (3×100 mL). The combined dichloromethane fractions were washed with water (50 mL) and brine (50 mL) and were dried (magnesium sulfate). Concentration of the organics afforded an oil which was subjected to flash chromatography on silica gel (1-3% methanol/dichloromethane). Two white crystals were obtained: compound 101 (1.88 g, 42%) elutes first and compound 102 (711 mg, 16%) elutes second. Compound 101: mp 85-90° C.; MS (ES+ calculated: 150.18; found: 151.15 M+H). HPLC (99%) purity, retention time 5.8 minutes—Method A); 1H NMR (400 MHz, DMSO-d6) δ 8.07 (s, 1H), 5.52 (s, 2H), 3.82 (t, J=7, 2H), 1.70 (m, 2H), 0.79 (t, J=7, 3H). Compound 102: mp 162-164° C.; MS (ES+ calculated: 150.18; found: 151.18 M+H). HPLC (95%) purity, retention time 6.4 minutes—Method A); 1H 1H NMR (400 MHz, DMSO-d6) δ 7.51 (s, 1H), 6.53 (s, 2H), 3.82 (t, J=7, 2H), 2.95 (m, 2H), 0.81 (t, J=7, 3H).

1. temperatureto cool
2. customthe DMF was removed on a rotary evaporator
3. additionWater was added (100 mL)
4. extractionthe organics were extracted with dichloromethane (3×100 mL)
5. washThe combined dichloromethane fractions were washed with water (50 mL) and brine (50 mL)
6. dry with materialwere dried (magnesium sulfate)
7. customConcentration of the organics afforded an oil which
8. customTwo white crystals were obtained

ORD record

ord-3d78e5331c8647869ea2d396e12f5a69

Source dataset

uspto-grants-2010_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07851468B2