Selenium Dioxide → HCID 86687800, compound

Temperature

100 °C

To a solution of 4-methyl-3-nitropyridin-2-amine (10.0 g, 65.0 mmol) in a mixture of dioxane (400 mL) and water (50 mL) was added selenium dioxide (29.0 g, 260 mmol) and the reaction mixture was heated to 100° C. for 16 hr and then cooled to RT and filtered through a pad of celite. The pad was washed with a mixture of EtOAc/THF (3:1 v/v, 100 mL) and the combined filtrate and washings were evaporated in vacuo. The residue was partitioned between EtOAc/THF (3:1 v/v, 100 mL) and sat aq. NaHCO3 (150 mL) diluted with water (150 mL). The aq layer was separated and was extracted with EtOAc/THF (3:1 v/v, 4×100 mL) and the combined organic extracts were dried and evaporated in vacuo to afford 2-amino-3-nitroisonicotinaldehyde as a brown solid (2.73 g, 25%); Rt 0.75 min (Method 2); m/z 168 (M+H)+, (ES+).

1. temperaturecooled to RT
2. filtrationfiltered through a pad of celite
3. washThe pad was washed with a mixture of EtOAc/THF (3:1 v/v, 100 mL)
4. customthe combined filtrate and washings were evaporated in vacuo
5. customThe residue was partitioned between EtOAc/THF (3:1 v/v, 100 mL)
6. additiondiluted with water (150 mL)
7. customThe aq layer was separated
8. extractionwas extracted with EtOAc/THF (3:1 v/v, 4×100 mL)
9. customthe combined organic extracts were dried
10. customevaporated in vacuo

ORD record

ord-116cac17c9c04e438cbdb0cf956da984

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08933228B2