2-(4-Nitro-1H-pyrazol-1-yl)ethan-1-ol → 2-(4-Amino-1H-pyrazol-1-yl)ethanol

A solution of 2-(4-nitro-1H-pyrazol-1-yl)ethanol (1.08 g, 6.87 mmol) in methanol (34 ml) was evacuated and purged with nitrogen and treated with palladium on carbon (0.1 g, 0.094 mmol). The resulting black suspension was evacuated and purged with a hydrogen balloon and stirred under hydrogen overnight. The mixture was filtered through celite with methanol washes, and concentrated. The residue was flash chromatographed (50 mm; 9% methanol/methylene chloride w/0.1% NH4OH then 10% methanol/methylene chloride w/0.1% NH4OH) to afford the title compound.

1. custompurged with nitrogen
2. customThe resulting black suspension was evacuated
3. custompurged with a hydrogen balloon
4. filtrationThe mixture was filtered through celite with methanol washes
5. concentrationconcentrated
6. customchromatographed (50 mm

ORD record

ord-2a0a196daeb74c7eb9b5aced72273814

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08426408B2