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Structure of 149682-75-7

Chemical Structure| 149682-75-7

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Product Details of [ 149682-75-7 ]

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

Safety of [ 149682-75-7 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H332-H335
Precautionary Statements:P261-P280-P305+P351+P338

Computational Chemistry of [ 149682-75-7 ] Show Less

Physicochemical Properties

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
Ertl P. et al. 2000 J. Med. Chem.

70.0 Ų

Lipophilicity

Log Po/w (iLOGP)?

iLOGP: in-house physics-based method implemented from
Daina A et al. 2014 J. Chem. Inf. Model.

0.0
Log Po/w (XLOGP3)?

XLOGP3: Atomistic and knowledge-based method calculated by
XLOGP program, version 3.2.2, courtesy of CCBG, Shanghai Institute of Organic Chemistry

0.6
Log Po/w (WLOGP)?

WLOGP: Atomistic method implemented from
Wildman SA and Crippen GM. 1999 J. Chem. Inf. Model.

0.02
Log Po/w (MLOGP)?

MLOGP: Topological method implemented from
Moriguchi I. et al. 1992 Chem. Pharm. Bull.
Moriguchi I. et al. 1994 Chem. Pharm. Bull.
Lipinski PA. et al. 2001 Adv. Drug. Deliv. Rev.

-0.27
Log Po/w (SILICOS-IT)?

SILICOS-IT: Hybrid fragmental/topological method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

-1.76
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

-0.28

Water Solubility

Log S (ESOL):?

ESOL: Topological method implemented from
Delaney JS. 2004 J. Chem. Inf. Model.

-1.29
Solubility 11.1 mg/ml ; 0.0516 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (Ali)?

Ali: Topological method implemented from
Ali J. et al. 2012 J. Chem. Inf. Model.

-1.64
Solubility 4.88 mg/ml ; 0.0227 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (SILICOS-IT)?

SILICOS-IT: Fragmental method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

0.11
Solubility 275.0 mg/ml ; 1.28 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Soluble

Pharmacokinetics

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)
and tested on 415 molecules (test set)
10-fold CV: ACC=0.72 / AUC=0.77
External: ACC=0.88 / AUC=0.94

No
CYP1A2 inhibitor?

Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.83 / AUC=0.90
External: ACC=0.84 / AUC=0.91

No
CYP2C19 inhibitor?

Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.80 / AUC=0.86
External: ACC=0.80 / AUC=0.87

No
CYP2C9 inhibitor?

Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set)
and tested on 2075 molecules (test set)
10-fold CV: ACC=0.78 / AUC=0.85
External: ACC=0.71 / AUC=0.81

No
CYP2D6 inhibitor?

Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set)
and tested on 1068 molecules (test set)
10-fold CV: ACC=0.79 / AUC=0.85
External: ACC=0.81 / AUC=0.87

No
CYP3A4 inhibitor?

Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set)
and tested on 2579 molecules (test set)
10-fold CV: ACC=0.77 / AUC=0.85
External: ACC=0.78 / AUC=0.86

No
Log Kp (skin permeation)?

Skin permeation: QSPR model implemented from
Potts RO and Guy RH. 1992 Pharm. Res.

-7.19 cm/s

Druglikeness

Lipinski?

Lipinski (Pfizer) filter: implemented from
Lipinski CA. et al. 2001 Adv. Drug Deliv. Rev.
MW ≤ 500
MLOGP ≤ 4.15
N or O ≤ 10
NH or OH ≤ 5

0.0
Ghose?

Ghose filter: implemented from
Ghose AK. et al. 1999 J. Comb. Chem.
160 ≤ MW ≤ 480
-0.4 ≤ WLOGP ≤ 5.6
40 ≤ MR ≤ 130
20 ≤ atoms ≤ 70

None
Veber?

Veber (GSK) filter: implemented from
Veber DF. et al. 2002 J. Med. Chem.
Rotatable bonds ≤ 10
TPSA ≤ 140

0.0
Egan?

Egan (Pharmacia) filter: implemented from
Egan WJ. et al. 2000 J. Med. Chem.
WLOGP ≤ 5.88
TPSA ≤ 131.6

0.0
Muegge?

Muegge (Bayer) filter: implemented from
Muegge I. et al. 2001 J. Med. Chem.
200 ≤ MW ≤ 600
-2 ≤ XLOGP ≤ 5
TPSA ≤ 150
Num. rings ≤ 7
Num. carbon > 4
Num. heteroatoms > 1
Num. rotatable bonds ≤ 15
H-bond acc. ≤ 10
H-bond don. ≤ 5

0.0
Bioavailability Score?

Abbott Bioavailability Score: Probability of F > 10% in rat
implemented from
Martin YC. 2005 J. Med. Chem.

0.55

Medicinal Chemistry

PAINS?

Pan Assay Interference Structures: implemented from
Baell JB. & Holloway GA. 2010 J. Med. Chem.

0.0 alert
Brenk?

Structural Alert: implemented from
Brenk R. et al. 2008 ChemMedChem

1.0 alert: heavy_metal
Leadlikeness?

Leadlikeness: implemented from
Teague SJ. 1999 Angew. Chem. Int. Ed.
250 ≤ MW ≤ 350
XLOGP ≤ 3.5
Num. rotatable bonds ≤ 7

No; 1 violation:MW<1.0
Synthetic accessibility?

Synthetic accessibility score: from 1 (very easy) to 10 (very difficult)
based on 1024 fragmental contributions (FP2) modulated by size and complexity penaties,
trained on 12'782'590 molecules and tested on 40 external molecules (r2 = 0.94)

3.01

Application In Synthesis of [ 149682-75-7 ]

* 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.

  • Downstream synthetic route of [ 149682-75-7 ]

[ 149682-75-7 ] Synthesis Path-Downstream   1~18

  • 1
  • [ 86953-79-9 ]
  • [ 149682-75-7 ]
  • 2
  • [ 149682-75-7 ]
  • [ 18680-27-8 ]
  • [ 205116-75-2 ]
YieldReaction ConditionsOperation 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.

  • 3
  • [ 121-43-7 ]
  • [ 149682-75-7 ]
YieldReaction ConditionsOperation 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.
  • 4
  • [ 149682-75-7 ]
  • (+)-(1S,2S,3R,5S)-pinanediol [ No CAS ]
  • C20H34BNO4 [ No CAS ]
YieldReaction ConditionsOperation 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.
  • 5
  • [ 149682-75-7 ]
  • [ 29333-10-6 ]
  • (1S,2R,3R, 5S)-pinanediol 1-((1,1-dimethylethoxy)carbonyl)pyrrolidine-2-boronate [ No CAS ]
  • 6
  • [ 1333-74-0 ]
  • [ 135884-31-0 ]
  • [ 149682-75-7 ]
  • 7
  • [ 149682-75-7 ]
  • (+)-pinanediol [ No CAS ]
  • C19H32BNO4 [ No CAS ]
  • C19H32BNO4 [ No CAS ]
  • 8
  • [ 149682-75-7 ]
  • potassium hydrogen difluoride [ No CAS ]
  • potassium (1-(tert-butoxycarbonyl)pyrrolidin-2-yl)trifluoroborate [ No CAS ]
  • 9
  • [ 149682-75-7 ]
  • [ 138371-54-7 ]
  • 10
  • [ 121-43-7 ]
  • [ 86953-79-9 ]
  • [ 149682-75-7 ]
YieldReaction ConditionsOperation 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).
  • 11
  • [ 149682-75-7 ]
  • [ 1437793-52-6 ]
  • C26H26N2O4S3 [ No CAS ]
  • 12
  • [ 149682-75-7 ]
  • [ 78-94-4 ]
  • 1,1-dimethylethyl 2-(3-oxobutyl)-1-pyrrolidinecarboxylate [ No CAS ]
  • 13
  • [ 135884-31-0 ]
  • [ 149682-75-7 ]
  • 14
  • [ 121-43-7 ]
  • [ 7732-18-5 ]
  • [ 86953-79-9 ]
  • [ 149682-75-7 ]
YieldReaction ConditionsOperation 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.
  • 15
  • [ 956833-12-8 ]
  • [ 149682-75-7 ]
  • methyl 2-((1-tert-butoxycarbonylpyrrolidine)-2-ylmethyl)-3-phenylacrylate [ No CAS ]
YieldReaction ConditionsOperation 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.
  • 16
  • [ 149682-75-7 ]
  • [ 76-09-5 ]
  • tert-butyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrolidine-1-carboxylate [ No CAS ]
YieldReaction ConditionsOperation 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.
  • 17
  • tert-butyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrolidine-1-carboxylate [ No CAS ]
  • [ 7732-18-5 ]
  • [ 149682-75-7 ]
  • 18
  • [ 149682-75-7 ]
  • N'-((5-bromopyridin-3-yl)methylene)-4-methoxybenzenesulfonohydrazide [ No CAS ]
  • tert-butyl 2-((5-bromopyridin-3-yl)methyl)pyrrolidine-1-carboxylate [ No CAS ]
 

Historical Records

Technical Information

Categories

Related Functional Groups of
[ 149682-75-7 ]

Organoborons

Chemical Structure| 149682-82-6

A378190 [149682-82-6]

(S)-tert-Butyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrolidine-1-carboxylate

Similarity: 0.83

Chemical Structure| 1048970-17-7

A218354 [1048970-17-7]

tert-Butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)piperidine-1-carboxylate

Similarity: 0.63

Chemical Structure| 844501-00-4

A159523 [844501-00-4]

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Chemical Structure| 135884-31-0

A219229 [135884-31-0]

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Chemical Structure| 286961-14-6

A130704 [286961-14-6]

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A378190 [149682-82-6]

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Chemical Structure| 86953-79-9

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Pyrrolidines

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