Sodium Carbonate → HCID 67167381, compound

Temperature

100 °C

To a mixture of 5-bromo-4-methylpyridin-2-amine (200 mg, 1.07 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (370 mg, 1.2 mmol) and sodium carbonate (400 mg, 1.28 mmol) in DMF/H2O (8/2 mL) was added tetrakis(triphenylphosphine) palladium (0) (62 mg, 5% mmol). The reaction tube is sealed, the mixture was purged with N2 for 3 min and then heated at 100° C. under N2 for overnight. The reaction was cooled to room temperature and poured into saturated aqueous ammonia chloride solution. The crude reaction mixture was extracted with ethyl acetate (3×15 mL). The organic extracts were combined, washed with brine and concentrated. The crude product was purified with silica gel column chromatography (80% ethyl acetate in hexanes) to afford tert-butyl 4-(6-amino-4-methylpyridin-3-yl)-5,6-dihydropyridine-1(2H)-carboxylate as a yellow oil. The obtained oil was dissolved in methanol (20 mL). To the solution was added Pd/C (10% w/w). The reaction mixture was degassed and purged with H2 for several times and then stirred under 1 atm. H2 overnight. The mixture was filtered and concentrated to afford tert-butyl 4-(6-amino-4-methylpyridin-3-yl)piperidine-1-carboxylate as a yellow solid; ESMS m/z 236 (M−56+H+).

1. customThe reaction tube is sealed
2. customthe mixture was purged with N2 for 3 min
3. temperatureThe reaction was cooled to room temperature
4. additionpoured into saturated aqueous ammonia chloride solution
5. customThe crude reaction mixture
6. extractionwas extracted with ethyl acetate (3×15 mL)
7. washwashed with brine
8. concentrationconcentrated
9. customThe crude product was purified with silica gel column chromatography (80% ethyl acetate in hexanes)

ORD record

ord-ec3bc8f16d9e4780a7f3d85a24f42c3f

Source dataset

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08445505B2