Stannous Chloride → (R)-4-chloro-N2-(1-methoxymethyl-propyl)-pyridine-2,3-diamine

Temperature

0 °C

(R)-(4-Chloro-3-nitropyridin-2-yl)-(1-methoxymethyl-propyl)-amine (2.09 g, 8.05 mmol) was dissolved in ether (30 mL) and cooled to 0° C. Next, SnCl2.2H20 (18.1 g, 80.5 mmol) in conc. HCl (10 mL) was added, dropwise at 0° C. and stirred at room temperature for 4 h. The reaction mixture was poured over ice water containing 50% NaOH solution (20 mL) and extracted with EtOAc (2×). The aqueous layer was filtered through celite, then extracted with EtOAc (2×). The combined organic layers were dried (Na2SO4), filtered, and concentrated in vacuo. The crude product was purified by column chromatography (20% EtOAc/Hex) to yield 0.24 g, 13% of (R)-4-chloro-N2-(1-methoxymethyl-propyl)-pyridine-2,3-diamine: MS (AP) m/z 229.71 [(M+H)+, 100].

1. extractionextracted with EtOAc (2×)
2. filtrationThe aqueous layer was filtered through celite
3. extractionextracted with EtOAc (2×)
4. dry with materialThe combined organic layers were dried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude product was purified by column chromatography (20% EtOAc/Hex)

ORD record

ord-c9d28828ff094ef382bec7156ec2a393

Source dataset

uspto-grants-2006_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07067658B2