Structure of 149682-75-7
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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. : | 149682-75-7 |
Formula : | C9H18BNO4 |
M.W : | 215.05 |
SMILES Code : | C1CCN(C1B(O)O)C(=O)OC(C)(C)C |
MDL No. : | MFCD02183523 |
InChI Key : | UIIUYLRUCQCTST-UHFFFAOYSA-N |
Pubchem ID : | 2762525 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H332-H335 |
Precautionary Statements: | P261-P280-P305+P351+P338 |
Num. heavy atoms | 15 |
Num. arom. heavy atoms | 0 |
Fraction Csp3 | 0.89 |
Num. rotatable bonds | 4 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 2.0 |
Molar Refractivity | 60.92 |
TPSA ? Topological Polar Surface Area: Calculated from |
70.0 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
0.0 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
0.6 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
0.02 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
-0.27 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
-1.76 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
-0.28 |
Log S (ESOL):? ESOL: Topological method implemented from |
-1.29 |
Solubility | 11.1 mg/ml ; 0.0516 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (Ali)? Ali: Topological method implemented from |
-1.64 |
Solubility | 4.88 mg/ml ; 0.0227 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
0.11 |
Solubility | 275.0 mg/ml ; 1.28 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 |
-7.19 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 |
0.0 |
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 |
1.0 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) |
3.01 |
* 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 |
---|---|---|
76% | In tert-butyl methyl ether; at 20℃; for 18.0h; | Example 1; Synthesis of (2R)-boroPro- (lS, 2S, 3R, 5S)-pinanediol ester, hydrochloride (2); [0280] A flame dried round bottom flask equipped with a magnetic stir bar was charged with N-Boc-pyrrolidine (20 g, 117 mmol, 1 eq) and dry THF (60 mL) under a nitrogen atmosphere. The clear colorless solution was cooled to-78C and a solution of s- BuLi (100 mL of a 1.4 M solution in cyclohexane, 140 mmol) was added slowly over a 30 minute period. The light orange colored solution was stirred at-78C for 3 hours followed by treatment with B (OMe) 3 (39 mL, 350 mmol) after which the cooling bath was removed and the clear colorless solution slowly warmed to 0C. Upon reaching 0C, the reaction was quenched with a small amount of water (-2 mL), allowed to warm to room temp then extracted into 2 N NaOH (250 mL) and backwashed with additional EtOAc (150 mL). The aqueous phase was acidified to pH 3 by the addition of 2 N HCl and then extracted with EtOAc (3 x 120 mL). The organic extracts were combined and dried over Na2SO4 and concentrated to produce the free boronic acid (22.08 g, 103 mmol) as a sticky white solid in 88% yield. Without further purification the boronic acid was dissolved in tert-butyl methyl ether (150 mL) and with constant stirring (+) -pinanediol (17.5 g, 103 mmol) was added at room temperature. After 18 hr the ether was removed and the (+) -pinanediol boronic ester was purified by column chromatography (silica gel, 1: 3 hexanes/EtOAc) to give a clear thick oil (26.84 g, 76.8 mmol, 76% yield, Rf= 0.6 using a 2: 1 hexane/ethyl acetate eluant, made visual via 12 and/or PMA stain). Removal of the Boc protecting group was achieved by dissolving the oil in dry ether, cooling to 0C in an ice bath and with constant stirring dry HCl (g) was bubbled into the solution for 10 minutes. After 2 hours a white precipitate developed in the flask and the ether and excess HCl were removed in vacuo to afford the racemic HCl salt as a white solid. Crystallization and isolation of the desired isomer was performed by dissolving the HCI salt in a minimal amount of dichloromethane (250 mL) with gentle heating to facilitate a homogenous solution followed by continuous stirring for 8 hours to yield a fluffy white precipitate that was collected by vacuum filtration, dried and then dissolved in minimal 2-propanol (-200 mL) with gentle heating until homogenous. The alcoholic solution was stirred over night and the resulting white precipitate was collected by vacuum filtration affording isomerically pure 1 as a white solid. (7.0 g, 27 mmol, 23% yield).'H NMR (400 MHz, D20) 8 4.28 (d, J= 8.0 Hz, lH), 3.06 (m, 3H), 2.18 (m, 1H), 1.96 (m, 2H), 1.78 (m, 3 H), 1.62 (m, 2H), 1.21 (s, 3H), 1.05 (m, 5H), 0.84 (d, J=12 Hz, 2H), 0.71 (s, 2H), 0.62 (s, 3H). |
12.1% | In ethyl acetate; at 20℃; for 18.0h; | General procedure: A flame dried round bottom flask equipped with a magnetic stir bar was charged with N-Boc-pyrrolidine (10g, 58mmol, 1eq) and dry THF (40mL) under a nitrogen atmosphere. The clear colorless solution was cooled to -78C and a solution of s-BuLi (64mL of a 1.0M solution in cyclohexane, 64mmol) was added slowly over a 30min period. The light orange colored solution was stirred at -78C for 3h followed by treatment with B(OMe)3 (15mL, 175mmol) after which the cooling bath was removed and the clear colorless solution slowly warmed to 0C. Upon reaching 0C, the reaction was quenched with a small amount of water (?2mL), allowed to warm to room temp then extracted into 2N NaOH (100mL) and backwashed with additional EtOAc (60mL). The aqueous phase was acidified to pH 3 by the addition of 2N HCl and then extracted with EtOAc (3×60mL). The organic extracts were combined and dried over Na2SO4 and concentrated to produce the free boronic acid 9g as a sticky white solid. Without further purification the boronic acid was dissolved in EtOAc (60mL) and with constant stirring (+)-pinanediol (7.0g, 41mmol) was added at room temperature. After 18h the ester was removed and the (+)-pinanediol boronic ester was purified by column chromatography (silica gel, 6:1 hexanes/EtOAc) to give a clear thick oil (12.1g, 34.8mmol) 60% yield in two steps. 1H NMR (400MHz, CDCl3) delta 4.50-4.15 (m, 1H), 3.38 (dt, J=13.8, 6.1Hz, 2H), 3.12 (ddd, J=25.1, 15.8, 8.4Hz, 1H), 2.33 (dd, J=12.3, 10.3Hz, 1H), 2.20 (s, 1H), 2.10-1.69 (m, 7H), 1.45 (d, J=7.3Hz, 9H), 1.41 (s, 3H), 1.28 (s, 3H), 0.84 (s, 3H). |
2.52 g | In tert-butyl methyl ether; at 20℃; for 12.0h; | Free boric acid C1 of Example 1 (2.1 g, 9.36 mmol)Soluble in 20mL methyl tert-butyl ether,Add (+)-pinanediol (1.75 g, 10 mmol) at room temperatureStirring was continued, and the reaction was completed after 12 hours.The solvent was distilled off and directly subjected to column chromatography (petroleum ether: ethyl acetate = 10:1)A clear viscous oil of 2.52 g was obtained in a yield of 76%. |
331 g | With magnesium sulfate; In tetrahydrofuran; for 2.0h; | (1) N-Boc-2-pyrrolidine boronic acid (215g, 1mol) is dissolved in tetrahydrofuran (1.5L),Add anhydrous magnesium sulfate (240g, 2mol) with stirring,Was then added (1S, 2S, 3R, 5S) -2,3- pinanediol (170g, 1mol),After two hours of reaction, it was filtered, washed, and the organic phase was concentrated and dried.331 g gave intermediate A1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
88% | Example 1; Synthesis of (2R)-boroPro- (lS, 2S, 3R, 5S)-pinanediol ester, hydrochloride (2); [0280] A flame dried round bottom flask equipped with a magnetic stir bar was charged with N-Boc-pyrrolidine (20 g, 117 mmol, 1 eq) and dry THF (60 mL) under a nitrogen atmosphere. The clear colorless solution was cooled to-78C and a solution of s- BuLi (100 mL of a 1.4 M solution in cyclohexane, 140 mmol) was added slowly over a 30 minute period. The light orange colored solution was stirred at-78C for 3 hours followed by treatment with B (OMe) 3 (39 mL, 350 mmol) after which the cooling bath was removed and the clear colorless solution slowly warmed to 0C. Upon reaching 0C, the reaction was quenched with a small amount of water (-2 mL), allowed to warm to room temp then extracted into 2 N NaOH (250 mL) and backwashed with additional EtOAc (150 mL). The aqueous phase was acidified to pH 3 by the addition of 2 N HCl and then extracted with EtOAc (3 x 120 mL). The organic extracts were combined and dried over Na2SO4 and concentrated to produce the free boronic acid (22.08 g, 103 mmol) as a sticky white solid in 88% yield. Without further purification the boronic acid was dissolved in tert-butyl methyl ether (150 mL) and with constant stirring (+) -pinanediol (17.5 g, 103 mmol) was added at room temperature. After 18 hr the ether was removed and the (+) -pinanediol boronic ester was purified by column chromatography (silica gel, 1: 3 hexanes/EtOAc) to give a clear thick oil (26.84 g, 76.8 mmol, 76% yield, Rf= 0.6 using a 2: 1 hexane/ethyl acetate eluant, made visual via 12 and/or PMA stain). Removal of the Boc protecting group was achieved by dissolving the oil in dry ether, cooling to 0C in an ice bath and with constant stirring dry HCl (g) was bubbled into the solution for 10 minutes. After 2 hours a white precipitate developed in the flask and the ether and excess HCl were removed in vacuo to afford the racemic HCl salt as a white solid. Crystallization and isolation of the desired isomer was performed by dissolving the HCI salt in a minimal amount of dichloromethane (250 mL) with gentle heating to facilitate a homogenous solution followed by continuous stirring for 8 hours to yield a fluffy white precipitate that was collected by vacuum filtration, dried and then dissolved in minimal 2-propanol (-200 mL) with gentle heating until homogenous. The alcoholic solution was stirred over night and the resulting white precipitate was collected by vacuum filtration affording isomerically pure 1 as a white solid. (7.0 g, 27 mmol, 23% yield).'H NMR (400 MHz, D20) 8 4.28 (d, J= 8.0 Hz, lH), 3.06 (m, 3H), 2.18 (m, 1H), 1.96 (m, 2H), 1.78 (m, 3 H), 1.62 (m, 2H), 1.21 (s, 3H), 1.05 (m, 5H), 0.84 (d, J=12 Hz, 2H), 0.71 (s, 2H), 0.62 (s, 3H). | |
Example 6 Synthesis of N-Acetyl-Gly-Boroproline 5 N-acetyl-gly-boroproline 5 was prepared according to the synthetic route of FIG. 1. Metallation of tert-butyl 1-pyrrolidinecarboxylate (N-t-BOC-pyrrolidine, Sigma-Aldrich Co.) in THF with sec-butyllithium, followed by addition of trimethylborate gave 1-(tert-butoxycarbonyl)pyrrolidin-2-yl-2-boronic acid 1 after quenching with aqueous NaOH and extraction. Borate esterification with the (1S, 2S, 3R, 5S), (+)-pinanediol in methyl, tert-butyl ether (MTBE) gave borate ester 2. Acid hydrolysis of the BOC protecting group and selective crystallization in isopropyl alcohol gave (+)-pinane 1-pyrrolidin-2-yl-2-boronate 3. Coupling of 3 and N-acetyl glycine with EDC (N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide), HOBt (1-hydroxybenzotriazole), and DiPEA (diisopropylethylamine gave the pinane borate of N-acetyl-gly-boroproline 4. Borate exchange of 4 with phenylboronic acid in MTBE and water gave N-acetyl-gly-boroproline 5. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tert-butyl methyl ether; | Example 6 Synthesis of N-Acetyl-Gly-Boroproline 5 N-acetyl-gly-boroproline 5 was prepared according to the synthetic route of FIG. 1. Metallation of tert-butyl 1-pyrrolidinecarboxylate (N-t-BOC-pyrrolidine, Sigma-Aldrich Co.) in THF with sec-butyllithium, followed by addition of trimethylborate gave <strong>[149682-75-7]1-(tert-butoxycarbonyl)pyrrolidin-2-yl-2-boronic acid</strong> 1 after quenching with aqueous NaOH and extraction. Borate esterification with the (1S, 2S, 3R, 5S), (+)-pinanediol in methyl, tert-butyl ether (MTBE) gave borate ester 2. Acid hydrolysis of the BOC protecting group and selective crystallization in isopropyl alcohol gave (+)-pinane 1-pyrrolidin-2-yl-2-boronate 3. Coupling of 3 and N-acetyl glycine with EDC (N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide), HOBt (1-hydroxybenzotriazole), and DiPEA (diisopropylethylamine gave the pinane borate of N-acetyl-gly-boroproline 4. Borate exchange of 4 with phenylboronic acid in MTBE and water gave N-acetyl-gly-boroproline 5. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
9% | With sec.-butyllithium; In tetrahydrofuran; cyclohexane; at -78℃; for 3.0h;Inert atmosphere; | A flame dried round bottom flask equipped with a magnetic stir bar was charged with N-Boc-pyrrolidine (10g, 58mmol, 1eq) and dry THF (40mL) under a nitrogen atmosphere. The clear colorless solution was cooled to -78C and a solution of s-BuLi (64mL of a 1.0M solution in cyclohexane, 64mmol) was added slowly over a 30min period. The light orange colored solution was stirred at -78C for 3h followed by treatment with B(OMe)3 (15mL, 175mmol) after which the cooling bath was removed and the clear colorless solution slowly warmed to 0C. Upon reaching 0C, the reaction was quenched with a small amount of water (?2mL), allowed to warm to room temp then extracted into 2N NaOH (100mL) and backwashed with additional EtOAc (60mL). The aqueous phase was acidified to pH 3 by the addition of 2N HCl and then extracted with EtOAc (3×60mL). The organic extracts were combined and dried over Na2SO4 and concentrated to produce the free boronic acid 9g as a sticky white solid. Without further purification the boronic acid was dissolved in EtOAc (60mL) and with constant stirring (+)-pinanediol (7.0g, 41mmol) was added at room temperature. After 18h the ester was removed and the (+)-pinanediol boronic ester was purified by column chromatography (silica gel, 6:1 hexanes/EtOAc) to give a clear thick oil (12.1g, 34.8mmol) 60% yield in two steps. 1H NMR (400MHz, CDCl3) delta 4.50-4.15 (m, 1H), 3.38 (dt, J=13.8, 6.1Hz, 2H), 3.12 (ddd, J=25.1, 15.8, 8.4Hz, 1H), 2.33 (dd, J=12.3, 10.3Hz, 1H), 2.20 (s, 1H), 2.10-1.69 (m, 7H), 1.45 (d, J=7.3Hz, 9H), 1.41 (s, 3H), 1.28 (s, 3H), 0.84 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
N-Boc-pyrrolidine (2g, 11.7mmol) under nitrogenDissolved in 30 mL of re-distilled anhydrous THF, the solution was cooled to -78 C,A solution of s-BuLi in hexane (14 mmol) was slowly added over 30 min.Then, stirring was continued at -78 C for 3 h;Treated with B(OMe)3 (3.9 mL, 35 mmol),After that, the temperature was slowly raised to about 0 C, and the reaction was quenched with a small amount of water (about 0.5 mL).After warming to room temperature, extract with 2N NaOH (25 mL) solution.The aqueous phase was adjusted to pH=3 by adding 2N hydrochloric acid to the aqueous phase.Extract with ethyl acetate (3 x 20 mL) and combine the organic phases.Drying over anhydrous sodium sulfate and evaporating the solvent gave a white viscous solid.The yield was 84%.The crude product was used in the next reaction without purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | With 1,4-diaza-bicyclo[2.2.2]octane; (4,4'-di-tert-butyl-2,2'-bipyridine)bis[3,5-difluoro-2-(5-trifluoromethyl-2-pyridinyl-kN)phenyl-kC]iridium(III)hexafluorophosphate; In 1-methyl-pyrrolidin-2-one; at 20℃; for 20.0h;Inert atmosphere; Irradiation; | General procedure: An 25 mL oven-dried Schlenk tube was equipped with a stirring bar, Baylis-Hillman derivative 1 (0.5mmol), organoboronic acids 2 or esters 3 (0.75 mmol, 1.5 eq), DABCO (0.1 mmol, 0.2 eq) and Ir[dF(CF3)ppy]2(bpy)PF6 (0.005 mmol, 1 mol%). The mixture was degassed by using standard Schlenk techniques with an oil pump. Then NMP (3 mL) were injected into the reaction tube. The reaction mixture was placed at a distance of about 5 cm from a 45 W compact fluorescent lamp and stirred at room temperature. After 20h, the reaction mixture was diluted with Et2O (30 mL) and H2O (20mL). The layers were separated. The aqueous layer was extracted with Et2O (2 × 30 mL). The combined organic layers were washed with H2O (2 × 10 mL) and then were dried over Na2SO4. Afterwards, the organic solution was concentrated under reduced pressure using a rotary evaporator and the purification was done by column chromatography on silica gel (200-300 mesh) with petroleum ether / ethyl acetate (20/1) as the eluent to give the pure product 4or 5. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
276 g | With magnesium sulfate; In tetrahydrofuran; for 2.0h; | (1) N-Boc-2-pyrrolidine boronic acid (215g, 1mol) is dissolved in tetrahydrofuran (1.5L),Add anhydrous magnesium sulfate (240g, 2mol) with stirring,Then add pinacol (118g, 1mol). After two hours of reaction, filter and wash.The organic phase was concentrated and dried to obtain 276 g of intermediate A2. |
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