Triethylamine → N2-(2-(dimethylamino)ethyl)pyridine-2,5-diamine

To a solution of 2-chloro-5-nitropyridine (500 mg, 3.1 mmol) in THF (30 mL) was added N1,N1-dimethylethane-1,2-diamine (310 mg, 3.5 mmol) and triethylamine (0.64 mL, 4.6 mmol) and the reaction mixture was stirred at room temperature for 16 h. The reaction mixture was concentrated, the residue was dissolved in dichloromethane and washed with 1 N HCl aq and water. The organic layer was dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated. The residue was dissolved in tetrahydrofuran (30 mL), degassed with nitrogen, charged with catalytic 10 wt. % Pd/C (0.3 g) and the reaction mixture was placed under an atmosphere of hydrogen (40 Psi) until the reduction was complete as indicated by LCMS analysis. The reaction mixture was filtered over diatomaceous earth and the filtrate was concentrated to provide the desired product (280 mg, 50%) as a purple solid: ESI MS m/z 181 [C9H16N4+H]+.

1. concentrationThe reaction mixture was concentrated
2. dissolutionthe residue was dissolved in dichloromethane
3. washwashed with 1 N HCl aq and water
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationthe filtrate was concentrated
7. dissolutionThe residue was dissolved in tetrahydrofuran (30 mL)
8. customdegassed with nitrogen
9. additioncharged with catalytic 10 wt. % Pd/C (0.3 g)
10. filtrationThe reaction mixture was filtered over diatomaceous earth
11. concentrationthe filtrate was concentrated

ORD record

ord-b19ec378e0e84561b4c457a533173d30

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09345709B2