Methyl 2-(3-methyl-4-nitro-1H-pyrazol-1-yl)acetate → 2-(4-Amino-3-methyl-pyrazol-1-yl)-ethanol

To solution of 3-methyl-4-nitropyrazol-1-yl-acetic acid methylester (ChemCollect, Remscheid, Germany, 297 mg, 1.491 mmol) in THF (12 ml) cooled with an ice-bath was added a 1 M solution of lithium aluminium hydride in THF (1.5 ml, 1.5 mmol). The reaction mixture was stirred 1 h at rt then was added more of the reducing reagent (0.75 ml, 0.75 mmol), stirring 2 h at rt, (1.5 ml, 1.5 mmol), stirring 45 min, (2 ml, 2 mmol) and the reaction mixture was stirred 17 h at rt before being quenched with water and taken in EtOAc. The suspension was filtered and the solid washed with EtOAc. The filtrate was dried over Na2SO4, filtered and evaporated to give crude brown solid. (HPLC: tR 0.85 min (Method A); M+H=142 MS-ES)

1. stirringstirring 2 h at rt, (1.5 ml, 1.5 mmol),
2. stirringstirring 45 min
3. stirring(2 ml, 2 mmol) and the reaction mixture was stirred 17 h at rt
4. custombefore being quenched with water
5. filtrationThe suspension was filtered
6. washthe solid washed with EtOAc
7. dry with materialThe filtrate was dried over Na2SO4
8. filtrationfiltered
9. customevaporated
10. customto give crude brown solid

ORD record

ord-740662206d3e4640b4a5ae5040ce0b7c

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08476294B2