Hydrogen Bromide → 3-Nitro-6,7-dihydro-5H-cyclopenta[b]pyridin-4-ol

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-methoxy-3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridine (1.535 g, 7.905 mmol) in AcOH (2.6 mL) was treated with 48% aq. HBr (2.6 mL, 23 mmol). The flask was sealed and heated at 130° C. for 40 min. then allowed to cool. The mixture was then concentrated under reduced pressure and the residue was neutralized to pH=7-8 using 50% NaOH in a cold bath. The mixture was then concentrated under reduced pressure and the residue was diluted with MeOH and THF, dried, filtered and concentrated to give the sub-title compound as a light brown powder. LCMS calc. for C8H9N2O3(M+H)+: m/z=181.3. Found: 181.2.

Provenance & Evidence