3-Amino-1H-pyrazole-4-carboxamide

5-Amino-1H-pyrazole-4-carbonitrile (1) (5 g, 0.046 mol) was added to cooled concentrated sulphuric acid (10 ml) with stirring sothat the temperature did not rise above 20 °C. The addition took about one-half hour and solution was stirred at room temperaturefor 4 h. The acid solution was then poured with stirring into ice and the solution was kept overnight in the refrigerator. The solid was then filtered and washed with water to free of excess sulphuric acid to afford the desired product 5-amino-1H-pyrazole-4-carboxylic acid amide (2) as white solid; (5.19 g, 89percent); mp 220-222 °C (Lit.mp 222-225 °C) [33].General procedure: To a suspension of pyrazole of general formulas (I) or (G) (0.50 mmol) in EtOH/water mixture (1 :1, lmL) aldehyde of general formula (II) (0.55 mmol), TFA (20 mol%), and isocyanide of general formula (III) (0.55 mmol) were added and stirred at room temperature for 15 minutes. (0136) Then the desired compound of general formulas (IV) or (IV?) was isolated by simple filtration followed by washing with water, then with EtOH.General procedure: To a suspension of pyrazole of general formulas (I) or (G) (0.50 mmol) in EtOH/water mixture (1 :1, lmL) aldehyde of general formula (II) (0.55 mmol), TFA (20 mol%), and isocyanide of general formula (III) (0.55 mmol) were added and stirred at room temperature for 15 minutes. (0136) Then the desired compound of general formulas (IV) or (IV?) was isolated by simple filtration followed by washing with water, then with EtOH.General procedure: To a suspension of pyrazole of general formulas (I) or (G) (0.50 mmol) in MeCN or THF (0.5 mL) aldehyde of general formula (II) (0.55 mmol), HClO4 (20 mol%), and isocyanide of general formula (III) (0.55 mmol) were added and stirred at room temperature for 6 h. Then the crude mixture was purified by filtration followed by washing with cold MeCN or by column chromatography on silica gel (eluent: hexane/EtOAc or chloroform/methanol gradient) to afford pure products of general formulas (IV) or (IV?).Sodium ethoxide (3 mol / L, ethanol solution) (74 mL)And ethanol (5.0 mL)

Molecular Weight:126.12
XLogP3:-0.7
Hydrogen Bond Donor Count:3
Hydrogen Bond Acceptor Count:3
Rotatable Bond Count:1
Exact Mass:126.05416083
Monoisotopic Mass:126.05416083
Topological Polar Surface Area:97.8
Heavy Atom Count:9
Complexity:126
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes