Structure of 6761-52-0
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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CAS No. : | 6761-52-0 |
Formula : | C5H7N5O |
M.W : | 153.14 |
SMILES Code : | O=C(C1=NC=CN=C1N)NN |
MDL No. : | MFCD00115105 |
InChI Key : | NSBRFKAXSNUXQO-UHFFFAOYSA-N |
Pubchem ID : | 1240109 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H332-H335 |
Precautionary Statements: | P261-P280-P305+P351+P338 |
Num. heavy atoms | 11 |
Num. arom. heavy atoms | 6 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 3.0 |
Molar Refractivity | 37.33 |
TPSA ? Topological Polar Surface Area: Calculated from |
106.92 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
0.63 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
-1.15 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
-1.33 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
-1.82 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
-1.38 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
-1.01 |
Log S (ESOL):? ESOL: Topological method implemented from |
-0.34 |
Solubility | 70.5 mg/ml ; 0.461 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (Ali)? Ali: Topological method implemented from |
-0.6 |
Solubility | 38.2 mg/ml ; 0.249 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-0.92 |
Solubility | 18.5 mg/ml ; 0.121 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 |
-8.05 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) |
2.03 |
* 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 |
---|---|---|
97% | With hydrazine hydrate; In ethanol; at 60℃; for 2h;Inert atmosphere; | Hydrazine monohydrate (34 mL, 1094.95 mmol) was added portionwise to a stirred suspension of methyl 3-aminopyrazine-2-carboxylate (21.3 g, 139.09 mmol) in ethanol (65 mL) at r.t. The resulting slurry was stirred at 60 C. for 2 hours, cooled to room temperature and filtered. The solid was washed with cold ethanol (2*25 ml) and dried to a constant weight to afford 3-aminopyrazine-2-carbohydrazide (20.75 g, 97%) as a beige solid: 1H NMR Spectrum; (DMSO-d6) 4.49 (2H, d), 7.46 (2H, br s,), 7.78 (1H, d), 8.17 (1H, d), 9.79 (1H, t); Mass Spectrum [M+H]+=154. |
97% | With hydrazine hydrate; In ethanol; at 20 - 60℃; for 2h; | Hydrazine monohydrate (34 mL, 1094.95 mmol) was added portionwise to a stirred suspension of methyl 3-aminopyrazine-2-carboxylate (21.3 g, 139.09 mmol) in ethanol (65 mL) at r.t. The resulting slurry was stirred at 60 C for 2 hours, cooled to room temperature and filtered. The solid was washed with cold ethanol (2 x 25 ml) and dried to a constant weight to afford 3-aminopyrazine-2-carbohydrazide (20.75 g, 97 %) as a beige solid: 1H NMR Spectrum: (DMSO-d6) 4.49 (2H, d), 7.46 (2H, br s,), 7.78 (IH, d), 8.17 (IH, d), 9.79 (IH, t); Mass Spectrum [M+H]+ = 154. |
97% | With hydrazine hydrate; In ethanol; at 20 - 60℃; for 2h;Inert atmosphere; | Hydrazine hydrate (34 mL, 1.1 mol) was added portionwise to a stirred suspension of methyl 3-aminopyrazine-2-carboxylate 37 (21.3 g, 139 mmol) in ethanol (65 mL) at room temperature. The resulting slurry was stirred at 60 C for 2 h, cooled to room temperature, and filtered. The solid was washed with cold ethanol (2 x 25 mL) and dried to a constant weight to afford 3-aminopyrazine-2-carbohydrazide (20.75 g, 97%) as a beige solid. TBTU (5.77 g, 18.0 mmol) was added portionwise over 15 min to a stirred suspension of DIPEA (8.5 mL, 49 mmol), 1-methylcyclopropanecarboxylic acid (1.63 g, 16.3 mmol) and 3-aminopyrazine-2-carbohydrazide (2.50 g, 16.3 mmol) in acetonitrile (40 mL). The mixture was stirred at 80 C for 20 min, and then cooled to 0 C. DIPEA (8.5 mL, 49 mmol) followed by 4-methylbenzene-1-sulfonylchloride (9.34 g, 49 mmol) were added over a period of 15 min. The reaction mixture was brought to reflux and allowed to stir at room temperature for 14 h. The mixture was concentrated, and the residue was diluted with DCM, washed with water and brine, dried over magnesium sulfate and concentrated. The crude product was purified by flash chromatography on silica gel eluting with 0 to 40% ethyl acetate in dichloromethane. After evaporation of the solvent, the resulting solid was triturated with diethyl ether, filtered, washed with the minimum of diethyl ether and dried to afford 3-(5-(1-methylcyclopropyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (2.12 g, 60%). NBS (1.87 g, 10.5 mmol) was added portionwise to a solution of 3-(5-(1-methylcyclopropyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (2.08 g, 9.6 mmol) in THF (30 mL). The reaction mixture was stirred at room temperature for 16 h and concentrated. The residue was dissolved in dichloromethane (150 mL), washed with water (2 x 40 mL), brine, dried over magnesium sulfate and concentrated. After evaporation of the solvents, the crude product was purified by flash chromatography on silica gel eluting with 0 to 10% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford 5-bromo-3-(5-(1-methylcyclopropyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (2.50 g, 88%) as a yellow solid. Bis(triphenylphosphine)palladium(II) chloride (59 mg, 0.08 mmol) was added in one portion to a stirred solution of 5-bromo-3-(5-(1-methylcyclopropyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (500 mg, 1.69 mmol) and hexamethyldistannane (0.49 mL, 2.4 mmol) dissolved in dioxane (8 mL) under argon. The resulting suspension was stirred at 80 C for 1 h. The mixture was evaporated. The crude product was purified by flash chromatography on silica gel eluting with 10 to 30% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford 3-(5-(1-methylcyclopropyl)-1,3,4-oxadiazol-2-yl)-5-(trimethylstannyl)pyrazin-2-amine 38a (314 mg, 49%) as a yellow crystalline solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | for 0.183333h;Microwave irradiation; | General procedure: Second step consists of condensation of <strong>[6761-52-0]3-aminopyrazine-2-carbohydrazide</strong> (0.5 gm, 0.003 mol) with aromatic aldehydes (0.5 gm, 0.008 mol) using microwaveirradiation (8 - 10 min, 350 W). After cooling and filtration,the product was recrystallized using ethanol [6, 9] (Fig. 1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
62% | for 0.116667h;Microwave irradiation; | General procedure: Second step consists of condensation of <strong>[6761-52-0]3-aminopyrazine-2-carbohydrazide</strong> (0.5 gm, 0.003 mol) with aromatic aldehydes (0.5 gm, 0.008 mol) using microwaveirradiation (8 - 10 min, 350 W). After cooling and filtration,the product was recrystallized using ethanol [6, 9] (Fig. 1). |
In ethanol;Microwave irradiation; | General procedure: Asolution of aromatic/substituted aldehydes (0.008 mole, 0.9gm) in 25ml ethanolwas added to a solution of compound 2(0.003 mol, 0.5gm) in 10 ml ethanol and wasirradiated in a microwave oven for 8-10 min (350 W). The resultanthydrazone was precipitated by addition of water (30 ml). The product wasfiltered and purified using ethanol. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | for 0.183333h;Microwave irradiation; | General procedure: Second step consists of condensation of <strong>[6761-52-0]3-aminopyrazine-2-carbohydrazide</strong> (0.5 gm, 0.003 mol) with aromatic aldehydes (0.5 gm, 0.008 mol) using microwaveirradiation (8 - 10 min, 350 W). After cooling and filtration,the product was recrystallized using ethanol [6, 9] (Fig. 1). |
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