Structure of 80370-42-9
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| CAS No. : | 80370-42-9 |
| Formula : | C6H8O4 |
| M.W : | 144.13 |
| SMILES Code : | O=C(OCC)C(C=O)C=O |
| MDL No. : | MFCD11112084 |
| InChI Key : | HMFLBGNCDZYITR-UHFFFAOYSA-N |
| Pubchem ID : | 11029955 |
| GHS Pictogram: |
|
| Signal Word: | Warning |
| Hazard Statements: | H315-H319-H335 |
| Precautionary Statements: | P261-P305+P351+P338 |
| Num. heavy atoms | 10 |
| Num. arom. heavy atoms | 0 |
| Fraction Csp3 | 0.5 |
| Num. rotatable bonds | 5 |
| Num. H-bond acceptors | 4.0 |
| Num. H-bond donors | 0.0 |
| Molar Refractivity | 32.64 |
| TPSA ? Topological Polar Surface Area: Calculated from |
60.44 Ų |
| Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
0.89 |
| Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
-0.15 |
| Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
-0.44 |
| Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
-0.66 |
| Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
0.52 |
| Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
0.03 |
| Log S (ESOL):? ESOL: Topological method implemented from |
-0.31 |
| Solubility | 70.7 mg/ml ; 0.491 mol/l |
| Class? Solubility class: Log S scale |
Very soluble |
| Log S (Ali)? Ali: Topological method implemented from |
-0.66 |
| Solubility | 31.2 mg/ml ; 0.216 mol/l |
| Class? Solubility class: Log S scale |
Very soluble |
| Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-0.28 |
| Solubility | 74.9 mg/ml ; 0.52 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
| BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
No |
| P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
| CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
No |
| CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
| CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
| CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
| CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
| Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-7.29 cm/s |
| Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
| Ghose? Ghose filter: implemented from |
None |
| Veber? Veber (GSK) filter: implemented from |
0.0 |
| Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
| Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
| Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
| PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
| Brenk? Structural Alert: implemented from |
2.0 alert: heavy_metal |
| Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
| Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.21 |
* 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.


[ 80370-42-9 ]
[ 100-05-0 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 72.4% | With hydrazine; In ethanol; at 0 - 20℃; for 17h; | 6.2 g (193 mmoles) of hydrazine was added, with ice-cooling, to a solution of 27.6 g (192 mmoles) of <strong>[80370-42-9](ethoxycarbonyl)malondialdehyde</strong> dissolved in 150 ml of ethanol. The mixture was stirred at room temperature for 17 hours to give rise to a reaction. The reaction mixture was subjected to vacuum distillation to remove the ethanol contained therein. The residue was purified by silica gel column chromatography (developing solvent: dichloromethane-ethyl acetate mixed solvent) to obtain 19.4 g (72.4percent) of ethyl 1H-pyrazole-4-carboxylate as yellow crystals. 1H-NMR [CDCl3/TMS, delta (ppm)]: 8.08 (2H,s), 5.30 (1H,s) 4.31 (2H,q), 1.36 (3H,t) |
| 72.4% | With hydrazine; In ethanol; at 20℃; for 17h; | REFERENCE EXAMPLE 29 Production of ethyl 1H-pyrazole-4-carboxylate; 6.2 g (193 mmoles) of hydrazine was added, with ice-cooling, to a solution of 27.6 g (192 mmoles) of <strong>[80370-42-9](ethoxycarbonyl)malondialdehyde</strong> dissolved in 150 ml of ethanol. The mixture was stirred at room temperature for 17 hours to give rise to a reaction. The reaction mixture was subjected to vacuum distillation to remove the ethanol contained therein. The residue was purified by silica gel column chromatography (developing solvent: dichloromethane-ethyl acetate mixed solvent) to obtain 19.4 g (72.4percent) of ethyl 1H-pyrazole-4-carboxylate as yellow crystals. 1H-NMR [CDCl3/TMS, delta (ppm)]: 8.08 (2H,s), 5.30 (1H,s), 4.31 (2H,q), 1.36 (3H,t) |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With N-ethyl-N,N-diisopropylamine; In ethanol; for 3h;Heating / reflux; | (4S,2R,3R,5R)-2-[2-hydrazino-6-(cyclopentylamino)purin-9-yl]-5- (hydroxymethyl)oxolane-3,4-diol (0.2 mmol) and ethyl 2,2-diformylacetate (0.28 mmol) were suspended in 3 mL of ethanol and to the suspension was added 5 mmol of diisopropylethylamiiie. The mixture was heated at reflux for 3 hours. Upon cooling to room temperature, the precipitate thus formed was collected by filtration, and washed with ethanol and ether to afford ethyl l-{9-[(4S,3R,5R)-3,4-dihydroxy-5- (hydroxymethyl)oxolan-2-yl]-6-(cyclopentylamino)purin-2-yl}pyrazole-4- carboxylate, a compound of Formula I. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| Formyl-3-oxo-propionic acid ethyl ester (75.85 g, 525.6 mmol) was dissolved in ethanol (1 L) at room temp. Tert-butylhydrazine hydrochloride (65.5 g, 525.6 mmol) was added at room temp and the reaction temperature gradually increased to 32° C. The flask was then placed in an ice-bath to cool it back to 20° C. It took ca. 1 h for t-butylhydrazine to fully dissolve. The solution was stirred at room temp. for 3 h. The reaction mixture was cooled in an ice-bath. Sodium hydroxide (4N, 152.4 g) was added to neutralize the hydrochloric acid. Most of the ethanol was then removed in vacuo and methanol (300 ml) was added followed by additional sodium hydroxide (4N, 304.8 g, 1.05 mol). The internal temperature gradually rose to 32° C. The reaction flask was then placed in a water bath to cool it back to room temp. and the reaction was allowed to stir at room temp. for 18 h. Methanol (300 ml) was then removed in vacuo with the water bath temperature kept below 30° C. The reaction mixture was then cooled to 0° C. and hydrochloric acid (6N, 190 ml) was added slowly to keep internal temperature below 15° C. The solution was adjusted to pH=2. The resulting suspension was allowed to stir in the ice-bath for 2 h, and the solid was filtered. After drying at 60° C. in vacuo for 2.5 days, 1-tert-butyl-1H-pyrazole-4-carboxylic acid (56.06 g) of off-white solid was collected. The mother liquor was extracted 3 times with dichloromethane (200 ml.x.3). The combined organic layer was washed once with brine (100 ml) and dried over magnesium sulfate. After concentrating in vacuo and drying, 16.5 g of yellowish solid was collected. The crude material was crystallized in hot iso-propyl acetate (25 ml) and heptane (25 ml). After cooling to room temp, the solid was filtered off and the cake was washed with mixed solvent of isopropyl acetate and heptane (1/1 (v/v, 14 ml) and dried in oven at 60° C. in vacuo for 5 h. A second crop of 1-tert-butyl-1H-pyrazole-4-carboxylic acid (7 g) was collected as a white solid. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In methanol; acetic acid; at 80℃; | Commercially available guanosine 5 was converted to the triacetate 6 as previously described (M. J. Robins and B. Uznanski, Can. J, Chem. (1981), 59, 2601-2607). Compound 7, prepared by following the literature procedure of Cerster et al. (J. F. Cerster, A. F. Lewis, and R.K. Robins, Org. Synthesis, 242-243), was converted to compound 9 in two steps as previously described (V. Nair et al., J. Org. Chem. , (1988), 53, 3051-3057). Compound 1 was obtained <n="30"/>by reacting hydrazine hydrate with compound 9 in ethanol at 80 C. Condensation of compound 1 with ethoxycarbonylmalondialdehyde in a mixture of AcOH and MeOH at 800C produced compound 10. Heating compound 10 in excess methylamine afforded compound11. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 15% | With sodium ethanolate; In ethanol; for 6h;Heating / reflux; | At room temperature, sodium ethoxide (590 mg) was dissolved in anhydrous ethanol (50 ml). 4-Amidinopyridine hydrochloride (1.31 g) was added to the resulting solution. After an anhydrous ethanol solution (ethanol: 50 ml) of ethyl 2,2-diformylacetate (1.20 g) was added dropwise, the resulting mixture was heated under reflux for 6 hours. Dichloromethane and water were added to the residue obtained by distilling off the solvent under reduced pressure. The organic layer thus separated was dried over anhydrous sodium sulfate. After the solvent was concentrated under reduced pressure, the residue was crystallized in ethanol, whereby the title compound (279 mg, 15percent) was obtained as colorless crystals.1H-NMR (DMSO-d6) delta: 1.46(3H,t,J=7.3Hz), 4.48 (2H, q, J=7.3Hz), 8.35 (2H, d, J=5.9Hz), 8.82(2H,d,J=5.9Hz), 9.38(2H,s). MS (FAB)m/z: 230(M+H)+. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 65% | In ethanol; at 0 - 20℃; | Example 16; Ethyl 1- (3-chlorophenyl)-lH-pyrazole-4-carboxylate; 3-Chlorophenylhydrazine hydrochloride (4.6 g, 25.7 mmol) in EtOH (100 mL) was added at 0 °C to a stirred solution of <strong>[80370-42-9]ethyl 2-formyl-3-oxopropanoate</strong> (3.7 g, 25.7 mmol) [J. Heterocyclic Chem. 1993,30, 865-872] in EtOH (80 mL). After addition was completed the reaction was allowed to reach rt, followed by stirring o. n. The reaction mixture was concentrated and the residue was recrystallized from EtOH to give 4.2 g (65percent) of the title compound. 1H NMR : 1.29 (t, 3H) 4.25 (q, 2H) 7.25 (d, 1H) 7.34 (t, 1H) 7.51 (d, 1H) 7.68 (s, 1H) 8.01 (s, 1H) 8.37 (s, 1H) |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 69% | In ethanol; | Ethyl 2-formyl-3-oxopropionate (775 mg) was added to a solution of the thus obtained 5-methoxymethyl-2H-pyrazol-3-ylamine (684 mg) in ethanol (50 ml), and stirred overnight. The reaction solution was concentrated under reduced pressure, and a saturated sodium bicarbonate solution was added to the residue which were then extracted with ethyl acetate. The organic phase was washed with a saturated saline solution and dried over sodium sulfate anhydrous. The resulting product was concentrated under reduced pressure, and the residue was purified by column chromatography (eluding solvent; n-hexane: ethyl acetate 4: 1) to give ethyl 2-methoxymethylpyrazolo[1,5-a] pyrimidine-6-carboxylate (878 mg, Y.: 69%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 68% | In ethanol; at 0℃;Cooling with ice; | A solution of <strong>[80370-42-9]2-formyl-3-oxo-propionic acid ethyl ester</strong> (S. H. Bertz et al., J. Org. Chem., 1982, 47, 2216) (1.44 g, 10 mmol) in EtOH (10 mL) was cooled in an ice bath. A slurry of 3-hydrazino-4-methyl-benzoic acid hydrochloride (2.02 g, 10 mmol) in EtOH (50 mL) was added and the reaction was stirred overnight. The EtOH was removed under reduced pressure and the residue partitioned between water and CH2Cl2. The layers were separated and the organic layer washed with brine. The organic layer was dried over Na2SO4, filtered, and concentrated. Hexanes were added and the solution concentrated. The resulting solid was collected by vacuum filtration, washed with hexanes and dried under vacuum to provide 1-(5-carboxy-2-methyl-phenyl)-1H-pyrazole-4-carboxylic acid ethyl ester (1.86 g, 68percent) as a yellow solid: ESI MS m/z 275 [C14H14N2O4+H]+. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 123 mg (66%) | With sodium hydrogencarbonate; In methanol; ethyl acetate; | Example 34 Ethyl 1-(4-{2-[(acetylamino)methyl]-5oxo-2-hydroisoxazol4-yl}phenyl)pyrazole-4-carboxylate To a mixture of N-[4-(4-hydrazinylphenyl)-5-oxo-2-hydroisoxazol-2-yl]methyl}acetamide hydrochloride (150 mg, 0.5 mmol) in 3 mL of methanol was added sodium bicarbonate (50 mg, 0.6 mmol) and ethoxycarbonylmalondialdehyde (75 mg, 0.52 mmol). The mixture was stirred at room temperature overnight. The solid was collected by filtration and then washed with water, and dried to yield 140 mg of a purple solid. The crude product was subjected to silica gel chromatography (eluding with ethyl acetate followed by 5percent methanol/ethyl acetate) to yield 123 mg (66percent) of the title compound as a yellow solid. 1H NMR (300 MHz, DMSO-d6) delta9.11 (s, 1H), 9.08 (s, 1H), 8.96 (t, J=6 Hz, 1H), 8.15 (s, 1H), 7.95 (m, 4H), 5.06 (d, J=6 Hz, 2H), 4.28, (q, J=7 Hz, 2H), 1.86 (s, 3H), 1.31 (t, J=7 Hz, 3H). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With sodium ethanolate; In ethanol; for 6h;Heating / reflux; Argon atmosphere; | 745mg, 5.17mmol) was dissolved in ethanol (15ml). Acetamidine hydrochloride (489mg, 5.17mmol) and sodium ethoxide in ethanol (0.41ml, 5.17mmol) were added and the mixture heated under argon at reflux for 6 hours and then overnight. The solvent was evaporated and the residue was treated with water (50ml) and extracted with diethyl EPO <DP n="34"/>ether (4 x 30ml). The diethyl ether layers were combined, dried over magnesium sulphate, filtered and evaporated. The crude product was purified using silica gel chromatography, eluting with a mixture of ethyl acetate and pentane (20-50percent) to afford the product (D33); MS (ES+) m/e 167 [M+H]+. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In acetic acid; at 60℃; for 18h; | 5-Amino-1H-[1,2,4]triazol-3-yl)-methanol (Bru-Magniez et al US (1995) US 5387747 A19950207) (7.9g, 41.6mmol) was mixed with <strong>[80370-42-9]2-formyl-3-oxo-propionic acid ethyl ester</strong> (Torri Sigeri et al Synthesis (1986) 5 pg 400-402), (6.0g, 41.6mmol) in acetic acid (30ml). The reaction mixture was heated to 60°C for 18hrs. After which time the mixture was cooled to room temperature and diluted with diethyl ether (200ml). Product crashes out of solution. The solids are then filtered and washed with diethyl ether (200ml), product dried in vacc oven for 5 hrs. To afford title compound as a white solid (8.0g). 1H NMR (300MHz, CDCI3): 5 1.47 (t, J=6.97, Hz, 3 H) 3.00 (bs, 1 H) 4.53 (q, J=7.16 Hz, 2 H), 5.00 (s, 2 H) 9.40 (d, J=2.07, Hz, 1 H) 9.50 (d, J=2.07, Hz, 1 H) |
[ 887365-58-4 ]
[ 80370-42-9 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 61% | acetic acid; at 180℃; for 0.25h;Microwave irradiation; | Example 8 [0286] 2-Amino-3-pyridm-2-yl-pyrazolo[1,5-a]pyrimidine-6-carboxyIic acid ethyl ester IV-1A mixture of 4-(pyridin-2-yl)-lH-pyrazole-3,5-diamine (0.10 g, 0.57 mmol), <strong>[80370-42-9](ethoxycarbonyl)malondialdehyde</strong> ( 0.084 g, 0.57 mmol) and 2 drops acetic acid in 1- propanol (3 mL) was heated in the microwave for 15 min at 180°C with stirring. The reaction was cooled down to room temperature and filtered, washing with ethanol and vacuum dried at 60°C for 3 days to provide the title compound as a brown solid (0.098 g, 61 percent yield). MS (ES+) 284. deltaEta (500 Mhz, DMSO-d6) 1.35 (3Eta, t), 4.36 (2H, q), 7.19 (1H, m), 7.36 (2H, s), 7.87 (1H, dt), 8.58 (2H, m), 8.82 (1H, d), 9.18 (1H, d) |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| To a dry 250ml 3-necked flask, sodium hydride (60percent in oil) (778mg, 32.4mmol) was added in diethyl ether (35ml). A condenser was attached and the flask placed under an atmosphere of argon. The mixture was stirred and cooled to 0 0C. Ethyl formate (22ml, 270mmol) was added dropwise, followed by a solution of methyl 3,3- bis(methyloxy)propanoate (3.83ml, 27.0mmol) in diethyl ether (25ml) added dropwise over 10 minutes. The mixture was stirred at 0 0C for 1.5 hours and then warmed to room temperature overnight. Poured into 100ml of ice-water and extracted with diethyl ether (3 x 50 ml) which was discarded. The aqueous phase was acidified (pH 3) with concentrated HCI (3ml) and extracted with dichloromethane (5 x 50ml), dried, filtered and evaporated. The residue was purified using silica gel chromatography, eluting with a mixture of methanol and dichloromethane (0-25percent) to afford the product (D32); MS (ES+) m/e 143 [M-H]". |


[ 80370-42-9 ]
[ 122535-03-9 ]| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| Zinc chloride; In ethanol; | Step A: Preparation of ethyl furo[3,2-b]pyridine-6-carboxylate To a solution of conc. hydrogen chloride (100 mL) containing zinc chloride (11.6 g, 83 mmoL) was added 3-(t-butoxycarbamoyl)furan (13.8 g, 75.4 mmol). After stirring for 5 minutes, the reaction mixture was diluted with ethanol (60 mL) and a solution of <strong>[80370-42-9]ethoxycarbonylmalonaldehyde</strong> (11.6 g, 80.6 mmol) in ethanol (40 mL) was added. This mixture was warmed at 80° C. for two hours and then cooled and poured into ice/water and made basic with ammonium hydroxide. The product was extracted into methylene chloride, dried over anhydrous sodium sulfate, filtered through a pad of charcoal and evaporated. This residue was chromatographed on silica gel eluding with chloroform to give 5.92 g of purified product. Crystallization from hexane provided product with, mp: 63°-65° C. Analysis calculated for C10 H9 NO3: N, 7.33; C, 62.82; H, 4.74. Found: N, 7.23; C, 63.09; H, 4.87. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 15% | With sodium ethanolate; In ethanol; dichloromethane; water; | [Referential Example 142] Ethyl-2-(4-pyridyl)-5-pyrimidinecarboxylic acid Sodium ethoxide (590 mg) was dissolved in anhydrous ethanol (50 ml) at room temperature. To the resulting solution, 4-amidinopyridine hydrochloride (1.31 g) was added, followed by the dropwise addition of a solution of ethyl 2,2-diformylacetate (1.20 g) in anhydrous ethanol (50 ml). The resulting mixture was heated under reflux for 6 hours. To the residue obtained by distilling off the solvent under reduced pressure, dichloromethane and water were added. The organic layer thus separated was dried over anhydrous sodium sulfate. After the solvent wasconcentrated under reduced pressure, the residue was crystallized in ethanol, whereby the title compound (279 mg, 15percent) was obtained as colorless crystals. 1H-NMR (DMSO-d6) delta: 1.46(3H,t,J=7.3Hz), 4.48(2H,q,J=7.3Hz), 8.35(2H,d,J=5.9Hz), 8.82(2H,d,J=5.9Hz), 9.38(2H,s). MS (FAB) m/z: 230 (M+H)+. Elementary analysis for C12H11N3O2 Calculated: C, 62.87; H, 4.84; N, 18.33. Found: C, 62.80; H, 4.78; N, 18.25. |
[ 897036-61-2 ]
[ 80370-42-9 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 77% | With sodium acetate; In ethanol; for 3h;Heating / reflux; | 1- [2-(2-Hydroxy-4-methyl-phenoxy)-phenyl]-IH- pyrazolbeta-4-carboxylic acid ethyl esterA solution of 2- (2-hydrazino-phenoxy) -5-methyl-phenol (Example 66) (100 mg, 0.434 mmol) , <strong>[80370-42-9]2-formyl-3-oxo-propionic acid ethyl ester</strong> (Bertz et al, J. Org. Chem. , 1982, 47, 2216) (63 mg, 0.434 mmol) and sodium acetate (36 mg, 0.434 mmol) in ethanol (1 mL) was refluxed for 3 hrs. The reaction was evaporated under reduced pressure and the residue was purified by flash chromatography on silica column eluted with ethyl acetate/hexane (30percent) . The Example title compound (113 mg, 77percent) was obtained asa white powder: M.P.: 118 - 119 0C; Ci9Hi8N2O4 (338.13): GC-MS (EI+) m/e: 338. This product was analyzed by 1H-NMR. The EPO <DP n="101"/>corresponding 1H-NMR spectrum was consistent with the structure of the anticipated product. |
[ 80370-42-9 ]
[ 15763-11-8 ]

[ 946390-52-9 ]| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In ethanol; for 2h;Heating / reflux; | EXAMPLE 5Preparation of Ethyl f 2EV3 -f i9- IT4S.2R,3R.5IO-3 ,4-dihvdroxy-5-rhvdroxymethylV oxolan-2-yl1-2-r4-(ethoxycarborivpipyrazolyllpurin-6-yl>aminoV2-forrnylprorho-2-enoate[0066] A mixture of 2-hydrazinoadenosine (100 g, 0.34 mol), ethyl 2-formyl-3- oxopropionate (242g, 1.7 mol) and absolute ethanl were charged to a reactor, and the mixture heated to reflux for 2 hours. When the reaction was judged complete, the heat source was removed and the mixture gradually cooled to 5-100C over a period of 3 hours. The slurry was stirred for 30 minutes at this temperature, and the mixture filtered. The solid material was washed with cold (5-100C) absolute ethanol, and then dried under vacuum at a temperature that did not exceed 400C, to provide ethyl (2E)-3- ({9-[(4S,2R,3R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-[4- (ethoxycarbonyl)-pyrazolyl]purin-6-yl}amino)-2-formylprop-2-enoate.[0067] An elemental analysis gave the following results: C, 48.75percent; H, 4.86percent; N, 18.05percent; O, 27.57. Theoretical: C, 49.72percent; H, 4.74percent; N, 18.45percent; O, 27.09. The analysis corresponds within experimental error limits to the hemihydrate of the desired product. (C, 48.89percent; H, 4.81percent; N, 18.1percent; O5 28.12)[0068] 1H and 13C NMR spectra were obtained in the following manner. 20.2mg of the compound of formula (4) was dissolved in ~0.75 ml of DMSO-d6, and the spectra obtained at ambient temperature on a JEOL ECX-400 NMR spectrometer operating at 400 MHz for 1H and 100 MHz for 13C. The chemical shifts were referenced to the DMSO solvent, 2.50 ppm for 1H and 39.5 ppm for 13C. | |
| In ethanol; for 2h;Heating / reflux; | [0073] A mixture of 2-hydrazinoadenosine (100 g, 0.34 mol), <strong>[80370-42-9]ethyl 2-formyl-3-oxopropionate</strong> (242g, 1.7 mol) and absolute ethanol were charged to a reactor, and the mixture heated to reflux for 2 hours. When the reaction was judged complete, the heat source was removed and the mixture gradually cooled to 5-100C over a period of 3 hours. The slurry was stirred for 30 minutes at this temperature, and the mixture filtered. The solid material was washed with cold (5-100C) absolute ethanol, and then dried under vacuum at a temperature that did not exceed 400C, to provide ethyl (2E)-3-({9-[(4S,2R,3R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2- yl]-2-[4-(ethoxycarbonyl)-pyrazolyl]purin-6-yl}amino)-2-formylprop-2-enoate. |
[ 80370-42-9 ]
[ 15763-11-8 ]

[ 946390-52-9 ]
[ 313348-16-2 ]| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With hydrogenchloride; In ethanol;Heating / reflux; | [0074] A reaction vessel is charged with 2-hydrazinoadenosine (450 g) and absolute ethanol (11376 g). HCl (7.47 g) and <strong>[80370-42-9]ethyl 2-formyl-3-oxopropionate</strong> (1557 g) are added. The mixture is heated to reflux and sampled until the level of residual 2-hydrazinoadenosine in the mixture is not more than 0.50percent and the level of the compound of formula (3) is not more than 2.5percent. The mixture is slowly cooled to approximately 100C. The product, the compound of formula (4) is isolated by filtration and washed with absolute ethanol (5121 g). The product is dried under vacuum at up to 400C until residual ethanol is not more than 5000 ppm to give ethyl (2E)-3-({9- [(4S,2R,3R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-[4-(ethoxycarbonyl)- pyrazolyl]purin-6-yl}amino)-2-formylprop-2-enoate.[0075] An elemental analysis of the product of Example 5 A gave the following results: C, 48.75percent; H, 4.86percent; N, 18.05percent; O, 27.57. Theoretical: C, 49.72percent; H, 4.74percent; N, 18.45percent; O, 27.09. The analysis corresponds within experimental error limits to the hemihydrate of the desired product. (C, 48.89percent; H, 4.81percent; N, 18.1percent; O, 28.12)[0076] 1H and 13C NMR spectra were obtained in the following manner. 20.2mg of the compound of formula (4) was dissolved in -0.75 ml of DMSO-d6, and the spectra obtained at ambient temperature on a JEOL ECX-400 NMR spectrometer operating at 400 MHz for 1H and 100 MHz for 13C. The chemical shifts were referenced to the DMSO solvent, 2.50 ppm for 1H and 39.5 ppm for 13C. <n="27"/>RESULTS[0077] The 1H and 13C chemical shifts are listed in Table 1. Two isomers in a ratio of -60/30 were observed in both the 1H and the 13C spectra, labeled as major and minor in the table. <n="28"/>The compound of formula (4) was confirmed to be a mixture of the following two isomers:Major Minor |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In ethanol; for 8h;Heating / reflux; | Step 3: 1-r6-rtetrahydro-2H-pyran-4-aminol-9-((1 R,2S,3R,4S)-2,3-dihvdroxy-4-propionylamino- cvclopentyl)-9H-purin-2-yll-1 H-pyrazole-4-carboxylic acid ethyl ester:To a solution of N-[(1 S, 2R, 3S, 4R)-4-(6-[tetrahydro-2H-pyran-4-amino]-2-hydrazino-purin-9-yl)- 2,3-dihydroxy-cyclopentyl]-propionamide in dry ethyl alcohol is added <strong>[80370-42-9]2-formyl-3-oxo-propionic acid ethyl ester</strong>, prepared according to the process illustrated at page 2217, Intermediate 1 of Bertz <n="35"/>52289A 34S. H., Dabbagh G. and Cotte P.; J. Org. Chem. 1982, 47, 2216-2217. The reaction mixture is heated at reflux for 8 hours then concentrated in vacuo. The crude residue is purified by chromatography on silica eluting with MeOH in chloroform to afford the title compound. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 90% | With pyridine; at 90℃; for 2h; | e)190 mg of <strong>[80370-42-9]ethyl 2-formyl-3-oxopropionate</strong> (1.32 mmol) are dissolved in 5 ml of absolute pyridine, and 252 mg of 3-hydroxymethylbenzamidinium acetate (1.2 mmol) are added. This suspension is heated at 90° for 2 hours in a heating block, during which everything dissolves. The reaction mixture is stirred into 30 ml of water. The deposited crystals are filtered off with suction, washed well with water and dried overnight at 80° in vacuo in a drying cabinet; yield: 279 mg of beige crystals=90percent of theory; ESI 301 (M+H), HPLC: Rt=3.06 min (method B). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In ethanol; for 8h;Reflux; | Step 3: 1-[6-[Bis-(4-methoxy-phenyl)-methyl]-amino}-9-((1R,2S,3R,4S)-2,3-dihydroxy-4-propionylamino-cyclopentyl)-9H-purin-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester To a solution of N-[(1S,2R,3S,4R)-4-(6-[Bis-(4-methoxy-phenyl)-methyl]-amino}-2-hydrazino-purin-9-yl)-2,3-dihydroxy-cyclopentyl]-propionamide (0.1 g, 0.177 mmol) in dry ethyl alcohol (5 ml) is added <strong>[80370-42-9]2-formyl-3-oxo-propionic acid ethyl ester</strong> (synthesised from ethyl-3,3-diethoxy-propionate, as described in: Bertz S. H., Dabbagh G. and Cotte P.; J. Org. Chem. (1982) 47, pp 2216-2217) (0.033 g, 0.231 mmol). The reaction mixture is heated at reflux for 8 hours then concentrated in vacuo. The crude residue is purified by chromatography on silica (60-120 mesh) eluding with 3percent methanol in chloroform to afford the title compound. LC-MS (0.1percent formic acid, acetonitrile): (MH+ 671). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In ethanol; at 20℃; for 1h; | ethyl 1-[4-(3,4-dichlorophenyl)-1,3-thiazol-2-yl]-1H-pyrazole-4-carboxylate To a solution of <strong>[80370-42-9]ethyl 2-formyl-3-oxopropanoate</strong> (0.57 g, 3.0 mmol) in ethanol (5 mL) was added thiosemicarbazide (1.37 g, 15 mmol), and the reaction mixture was stirred at room temperature for 1 hr. 2-Bromo-1-(3,4-dichlorophenyl)ethanone (0.54 g, 2.0 mmol) was added, and the mixture was stirred at 80°C for 30 min, and cooled to room temperature. The precipitated crystals were collected by filtration to give the title compound (545 mg, 74percent) as orange crystals. 1H NMR (400 MHz, CHLOROFORM-d) delta ppm 1.40 (3 H, t, J=7.2 Hz), 4.37 (2 H, q, J=7.2 Hz), 7.35 (1 H, s), 7.51 (1 H, d, J=8.6 Hz), 7.72 (1 H, dd, J=8.4, 2.1 Hz), 8.03 (1 H, d, J=2.2 Hz), 8.11 (1 H, d, J=0.5 Hz), 8.89 (1 H, d, J=0.5 Hz) LCMS(ESI+)M+H: 368. |
Tags: 80370-42-9 synthesis path| 80370-42-9 SDS| 80370-42-9 COA| 80370-42-9 purity| 80370-42-9 application| 80370-42-9 NMR| 80370-42-9 COA| 80370-42-9 structure

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