3-nitro-1-(2-phenylethyl)-1H-pyrazole synthesis
- Product Name:3-nitro-1-(2-phenylethyl)-1H-pyrazole
- CAS Number:876343-26-9
- Molecular formula:C11H11N3O2
- Molecular Weight:217.22
103-63-9
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Yield:876343-26-9 78%
Reaction Conditions:
Stage #1: 3-nitro-1H-pyrazolewith sodium hydride in N,N-dimethyl-formamide; for 0.333333 h;
Stage #2: 1-phenyl-2-bromoethane in N,N-dimethyl-formamide; for 2 h;
Steps:
30
To a solution of 3-nitro-1H-pyrazole (prepared in example 3, 200 mg, 1.77 mmol) in anhydrous N,N-dimethylformamide (2 mL), a 60% dispersion of sodium hydride in mineral oil (92 mg, 2.30 mmol) was added while stirring under nitrogen. After the effervescence ceased and the mixture was stirred for additional 20 min, (2-bromo-ethyl)-benzene (426 mg, 2.30 mmol) was added. The mixture was continued to stir under nitrogen for an additional 2 h. The solvent was removed in vacuo and purification by ISCO flash column chromatography (Teledyne Isco RediSep Flash Column 40 g; 2% methanol/methylene chloride to 5% methanol/methylene chloride) afforded 3-nitro-1-phenethyl-1H-pyrazole (301 mg, 78%) as a white solid: H1-NMR (400 MHz, CDCl3) δ: 3.21 (3H, t, J=7.0 Hz), 4.41 (3H, t, J=6.9 Hz), 6.76 (1H, d, J=2.3 Hz), 7.07 (2H, m), 7.15 (1H, d, J=2.3 Hz), 7.27 (3H, m).
References:
US2008/21032,2008,A1 Location in patent:Page/Page column 39-40
