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CAS No. : | 51516-70-2 | MDL No. : | MFCD00102729 |
Formula : | C10H7FN4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | SZEJYPAPBGNEMH-UHFFFAOYSA-N |
M.W : | 202.19 | Pubchem ID : | 688685 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
61% | In ethanol; for 2h;Reflux; | General procedure: A mixture of the appropriate phenylhydrazine (0.001 mol)and 10 mL of ethanol was stirred and allowed to reflux.Then, 2-(ethoxymethylene)malononitrile (0.001 mol) dissolvedin 10 mL of ethanol was slowly added. The reactionmixture was refluxed for 2 h. The reaction mixture waspoured into 50 mL of ice-cold water. The precipitate wascollected by filtration and washed with water to provide10a-c in 61-80% yield.5-amino-1-(4-fluorophenyl)-1H-pyrazole-4-carbonitrile (10a)Yield: 61%. MP: 173-174 C. IR (cm-1): 3297-3183; 2225;1662; 1568; 1222. 1H NMR (400 MHz, DMSO-d6, TMS, deltain p.p.m.): 7.31-7.25; (m; 2 H; H3?, H5?); 7.54-7.49; (m;2H; H2?, H6?); 7.67; (s; 1 H; H3). 13C NMR (100 MHz,DMSO-d6, TMS, delta in ppm): 73.2 (C4); 114.8 (CN); 116.3(d; J = 22.8 Hz; C3?, C5?); 126.9 (d; J = 8.9 Hz; C2?, C6?);133.7 (d; J = 2.8 Hz; C1?) 141.7 (C5); 151.4 (C3); 161.2 (d;J = 243.6 Hz; C4?). 19F NMR (376 MHz, DMSO-d6, TMS, deltain p.p.m.): -114.26. EI [M + 1]+ 203.07. |
61% | In ethanol; for 2h;Reflux; | General procedure: A mixture of the appropriate phenylhydrazine (0.001 mol) and10 mL of ethanol was stirred and allowed to reflux. Then, 2-(ethoxymethylene)malononitrile (0.001 mol) dissolved in 10 mL of ethanol was slowly added. The reaction mixture was refluxed for 2 h. The reaction mixture was poured into 50 mL of ice-cold water. The precipitate was collected by filtration and washed with water to produce 7-12 in 48-90% yield. |
In ethanol; for 3h;Reflux; | General procedure: A stirred mixture of para-substituted phenylhydrazine hydrochloride (0.025 mol) was dissolved inH2O (30 mL), then the pH of the mixture was adjusted to pH 7-8 by the dropwise addition of 10% NaOHsolution to form the free para-substituted phenyl hydrazines, which were then refluxed for 3 h withethoxymethylene malononitrile in an ethanol medium. After completion of the reaction, the reactionmixture was allowed to cool at room temperature, and the solid 2a-2d were filtered under vacuum. Thecrude products obtained were recrystallized from DMF to afford the pure products. |
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