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Chemical Structure| 89942-77-8 Chemical Structure| 89942-77-8

Structure of 89942-77-8

Chemical Structure| 89942-77-8

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Product Details of [ 89942-77-8 ]

CAS No. :89942-77-8
Formula : C8H7NO5
M.W : 197.14
SMILES Code : COC(=O)C1=C(C(O)=CC=C1)[N+]([O-])=O
MDL No. :MFCD09951956
Boiling Point : No data available
InChI Key :FHCNMPYMCKHBTK-UHFFFAOYSA-N
Pubchem ID :13659833

Safety of [ 89942-77-8 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302
Precautionary Statements:P280-P305+P351+P338

Computational Chemistry of [ 89942-77-8 ] Show Less

Physicochemical Properties

Num. heavy atoms 14
Num. arom. heavy atoms 6
Fraction Csp3 0.12
Num. rotatable bonds 3
Num. H-bond acceptors 5.0
Num. H-bond donors 1.0
Molar Refractivity 48.57
TPSA ?

Topological Polar Surface Area: Calculated from
Ertl P. et al. 2000 J. Med. Chem.

92.35 Ų

Lipophilicity

Log Po/w (iLOGP)?

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

1.44
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

1.86
Log Po/w (WLOGP)?

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

1.09
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.

0.3
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

-0.9
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

0.76

Water Solubility

Log S (ESOL):?

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

-2.35
Solubility 0.874 mg/ml ; 0.00443 mol/l
Class?

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

Soluble
Log S (Ali)?

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

-3.42
Solubility 0.0748 mg/ml ; 0.00038 mol/l
Class?

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

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

-1.28
Solubility 10.3 mg/ml ; 0.052 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.

-6.18 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

1.0
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

2.0 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)

2.06

Application In Synthesis of [ 89942-77-8 ]

* 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 [ 89942-77-8 ]

[ 89942-77-8 ] Synthesis Path-Downstream   1~35

  • 1
  • [ 602-00-6 ]
  • [ 89942-77-8 ]
YieldReaction ConditionsOperation in experiment
100% SOCI2 (0.6 mL) was added dropwise to anhydrous MeOH (10 mL) at O0C. The mixture was stirred at this temperature for 0.5 h, then 3-hydroxy-2-nitrobenzoic acid (0.6 g, 3.2 mmol) was added to the mixture. The resulting mixture was heated at reflux for 4 h. TLC (petroleum ether: ethyl acetate = 1 :1) showed the <n="74"/>reaction was complete. The resulting mixture was concentrated in vacuo to give the title compound (0.63 g 100%) as a brown solid.
With thionyl chloride; In methanol; Step 1 To a methanol solution (15 mL) at 0 C. was dropwise added thionyl chloride (6.4 mL, 0.088 mol). After 15 minutes, 3-hydroxy-2-nitrobenzoic acid (4 g, 0.022 mol) was added and the resulting mixture was stirred at room temperature for 72 hours. Volatile was removed under vacuo and the residue was partitioned between water and ethyl acetate. The organic layer was separated, washed with water and saturated sodium chloride, and was dried over sodium sulfate. After concentration, the crude product was recrystallized from dichloromethane and hexane to gave 4.5 g of methyl 3-hydroxy-2-nitrobenzoate.
With hydrogenchloride; sodium chloride; sodium hydrogencarbonate; In methanol; dichloromethane; water; 1st Stage Preparing Methyl (3-Hydroxy-2-nitro)benzoate 3-hydroxy-2-nitrobenzoic acid (5 g; 27.32 mM) was dissolved in anhydrous methanol (200 ml). Anhydrous hydrogen chloride gas was bubbled through the solution until saturated. The mixture was then refluxed for 20 hours (reaction followed by T.L.C.: 10% methanol/90% dichloromethane). Next, the solvent was removed under vacuum to yield a brown solid. The solid was dissolved in water (100 ml) and sodium bicarbonate was added until effervescence stopped. Sodium chloride (15 g) was added to the aqueous solution, and the product was extracted into ethyl acetate (3*50 ml). The pooled aliquots were dried over magnesium sulphate and the solvent removed under vacuum to yield a malty brown solid.
  • 2
  • [ 89942-77-8 ]
  • [ 17672-21-8 ]
YieldReaction ConditionsOperation in experiment
99% With palladium on activated charcoal; hydrogen; Our next target was the synthesis of 2-aminophenol derivative 8, which was desirable for the construction of 4 (Scheme 5). Selective reduction of the carboxyl ester 11 by LiAlH4 in dry THF or NaBH4 in THF/MeOH gave 13 in up to 92-98% yield (Scheme 6). The deprotection of methoxyl group of 13 by AlCl3, however, gave 14 in only 61% yield, along with some unreacted 13. Although the deprotection of 13 by BBr3 also gave 14, the reaction mixture contained several unidentified by-products. Selective reduction of ester 12 by NaBH4 in THF/MeOH even did not proceed. We finally found 12 could be reduced by LiAlH4 in anhydrous THF to afford 14 in about 82% yield. Then the desirable 8 was prepared by hydrogenation catalyzed by Pd/C.
95% With iron; acetic acid; In ethanol; for 2h;Heating; At room temperature, 8 g (40.58 mmol) of <strong>[89942-77-8]methyl <strong>[89942-77-8]3-hydroxy-2-nitrobenzoate</strong></strong> were dissolved in 160 ml of a mixture (1:1) of acetic acid and ethanol. 9.971 g (178.55 mmol) of iron powder were added to the solution, and the mixture was heated at the boil for 2 h. The mixture was cooled to room temperature, 50 ml of water were added and the mixture was extracted twice with 100 ml of ethyl acetate. The organic phase was washed with dilute sodium bicarbonate solution until neutral and dried over sodium sulfate. The solvent was removed under reduced pressure, giving 6.50 g (95% of theory) of the desired methyl 2-amino-3-hydroxybenzoate. 1H-NMR (400 MHz, DMSO-d6 delta in ppm) 9.66 (s, 1H), 7.20 (d, 1H), 6.81 (d, 1H), 6.39 (t, 1H), 6.09 (br. s, 2H), 3.78 (s, 3H). 700 mg (4.19 mmol) of methyl 2-amino-3-hydroxybenzoate, 877 mg (4.19 mmol) of 2,4-dichlorobenzoyl chloride and 210 mg (0.838 mmol) of 4-methylbenzenesulfonic acid monohydrate were suspended 10 ml of xylene in a microwave vial. The vial was sealed with a septum cap and the mixture was heated in a Biotage Initiator Sixty microwave at 160 C. for 25 min. After cooling to room temperature, the solvent was removed under reduced pressure and the crude product was purified by column chromatography (n-heptane:ethyl acetate 4:1?ethyl acetate), giving 500 mg (35% of theory) of methyl 2-(2,4-dichlorophenyl)-1,3-benzoxazole-4-carboxylate. 1H-NMR (CDCl3 delta in ppm): 8.21 (d, 1H), 8.08 (d, 1H), 7.81 (dd, 1H), 7.59 (d, 1H), 7.48 (t, 1H), 7.42 (dd, 1H), 4.05 (s, 3H). 450 mg (1.40 mmol) of methyl 2-(2,4-dichlorophenyl)-1,3-benzoxazole-4-carboxylate and 0.838 ml of 2 N aqueous sodium hydroxide solution were dissolved in 10 ml of THF and 2 ml of water. The solution was stirred at room temperature overnight, resulting in the precipitation of a solid. The suspension was acidified with 2 N hydrochloric acid and the resulting solid was filtered off with suction. The solid was air-dried, giving 300 mg (66% of theory) of the desired 2-(2,4-dichlorophenyl)-1,3-benzoxazole-4-carboxylic acid. 1H-NMR (CDCl3 delta in ppm): 11.62 (br. s, 1H), 8.23-8.18 (m, 2H), 7.88 (d, 1H), 7.67 (d, 1H), 7.60 (t, 1H), 7.49 (dd, 1H). 250 mg (0.81 mmol) of 2-(2,4-dichlorophenyl)-1,3-benzoxazole-4-carboxylic acid, 132 mg (0.97 mmol) of 1-hydroxy-1H-benzotriazole, 171 mg (0.89 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 10 mg of DMAP were dissolved in 5 ml of dichloromethane. The mixture was stirred at room temperature for 15 min, and 1.78 ml of a 0.5 M solution of ammonia in 1,4-dioxane were then added dropwise. The mixture was stirred at room temperature for 2 h and the organic phase was washed twice with 0.5 N hydrochloric acid and once with dilute sodium bicarbonate solution. The solvent was removed under reduced pressure and the residue was suspended in acetonitrile and then heated in an ultrasonic bath. The solid was filtered off with suction and air-dried. This gives 120 mg (45% of theory) of 2-(2,4-dichlorophenyl)-1,3-benzoxazole-4-carboxamide. 1H-NMR (DMSO-d6 delta in ppm): 8.42 (br. s, 1H), 8.33 (d, 1H), 8.07-8.01 (m, 3H), 7.98 (d, 1H), 7.71 (d, 1H), 7.62 (dd, 1H).
palladium/carbon catalyst; In methanol; 2nd Stage Preparation of Methyl (2-Amino-3-hydroxy)benzoate Under a nitrogen atmosphere a palladium/carbon catalyst was suspended in anhydrous methanol (150 ml). To this suspension was added methyl (3-hydroxy-2-nitro) benzoate from Stage 1 (4 g; 20.3 mM). The mixture was left under a hydrogen atmosphere for 41/2 hours. The catalyst was removed by filtration through a "celite" pad, and the solvent removed from the filtrate to yield an orange/brown product.
With hydrogen;palladium on activated charcoal; In ethyl acetate; at 25℃; under 760.051 Torr; for 4h; Example 113 Cmethyl 2-amino-3-hydroxybenzoate; A suspension of <strong>[89942-77-8]methyl <strong>[89942-77-8]3-hydroxy-2-nitrobenzoate</strong></strong> (14 g, 71 mmol) and 10% Pd/C (1.4 g) in ethyl acetate (300 mL) was purged in 1 atm hydrogen and stirred at 25 C. for 4 hr. The mixture was filtered, and the filtrate was concentrated to give methyl 2-amino-3-hydroxybenzoate (11.5 g, yield 97%) as a light yellow solid. 1H-NMR (400 MHz, CDCl3-d) delta 3.88 (s, 1H), 5.84 (s, br 3H), 6.50-6.54 (t, J=8.0 Hz, 1H), 6.84-6.86 (d, J=7.2 Hz, 1H), 7.47-7.49 (d, J=7.6 Hz, 1H); LC-MS (ESI) m/z 168 [M+1]+.

  • 3
  • [ 89942-77-8 ]
  • [ 108-24-7 ]
  • [ 90945-76-9 ]
  • 4
  • [ 89942-77-8 ]
  • [ 100-44-7 ]
  • [ 533897-93-7 ]
  • 5
  • [ 4437-18-7 ]
  • [ 89942-77-8 ]
  • [ 105918-52-3 ]
  • 6
  • [ 89942-77-8 ]
  • [ 92252-50-1 ]
  • [ 105918-47-6 ]
  • 8
  • [ 89942-77-8 ]
  • [ 100-52-7 ]
  • [ 128156-57-0 ]
  • 3-Hydroxy-2-[1-phenyl-meth-(E)-ylidene]-amino}-benzoic acid methyl ester [ No CAS ]
  • 9
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • 9-hydroxy-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 10
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • [ 106-95-6 ]
  • 10-allyl-9-hydroxy-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 11
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • 3,4,5-(MeO)3-C6H2CH2-X [ No CAS ]
  • 9-hydroxy-10-(3,4,5-trimethoxy-benzyl)-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 12
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • 4-MeO-C6H4CH2-X [ No CAS ]
  • 9-hydroxy-10-(4-methoxy-benzyl)-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 13
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • Me-X [ No CAS ]
  • 9-hydroxy-10-methyl-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 14
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • PhCH2-X [ No CAS ]
  • 10-benzyl-9-hydroxy-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 15
  • [ 89942-77-8 ]
  • [ 2577-48-2 ]
  • prenyl-X [ No CAS ]
  • 9-hydroxy-10-(3-methyl-but-2-enyl)-1,2,3,11a-tetrahydro-10<i>H</i>-benzo[<i>e</i>]pyrrolo[1,2-<i>a</i>][1,4]diazepine-5,11-dione [ No CAS ]
  • 16
  • [ 89942-77-8 ]
  • [ 91-66-7 ]
  • [ 17672-21-8 ]
  • [ 128156-55-8 ]
  • 17
  • [ 134419-59-3 ]
  • [ 89942-77-8 ]
  • [ 956100-57-5 ]
YieldReaction ConditionsOperation in experiment
100% With potassium carbonate; In acetonitrile; for 20h;Heating / reflux; Methyl <strong>[89942-77-8]3-hydroxy-2-nitrobenzoate</strong> (95 g, 0.52 mol), tetrahydro-2H-pyran-4-yl methanesulfonate (234 g, 1.3 mol) and K2CO3 (358 g, 2.6 mol) was suspend in MeCN (2 L). The mixture was heated at reflux for 20 h. TLC (petroleum ether: ethyl acetate = 1:1) showed the reaction was complete. The mixture was filtered; the filtrate was concentrated in vacuo. The residue was purified by chromatography (petroleum ether: ethyl acetate=10:1 , 5:1 , 2:1) to give the title compound (200 g 100%) as a yellow oil.
  • 18
  • [ 89942-77-8 ]
  • [ 105918-51-2 ]
  • 19
  • [ 89942-77-8 ]
  • [ 105918-50-1 ]
  • 20
  • [ 89942-77-8 ]
  • 2-Amino-3-(3-furan-2-yl-propoxy)-benzoic acid methyl ester [ No CAS ]
  • 21
  • [ 89942-77-8 ]
  • [ 105918-48-7 ]
  • 22
  • [ 89942-77-8 ]
  • [ 24115-89-7 ]
  • 24
  • [ 89942-77-8 ]
  • [ 24115-90-0 ]
  • 25
  • [ 89942-77-8 ]
  • [ 90922-69-3 ]
  • 26
  • [ 89942-77-8 ]
  • [ 70441-00-8 ]
  • 27
  • [ 89942-77-8 ]
  • [ 872311-04-1 ]
  • 28
  • [ 89942-77-8 ]
  • [ 100-39-0 ]
  • [ 533897-93-7 ]
YieldReaction ConditionsOperation in experiment
91% With potassium carbonate; In DMF (N,N-dimethyl-formamide); at 100℃; for 2h; A mixture of part A compound (1.0 g, 5.07 mmol) and potassium carbonate (700 mg, 5.07 mmol) in dry DMF (10 mL) was treated with benzyl bromide (992 mg, 5.8 mmol) and heated at 100 C. for 2 h. The mixture was concentrated and partitioned between EtOAc (3×50 mL) and water (10 mL). The organic phase was washed with H2O ( 3×10 mL) and brine (10 mL), dried (MgSO4) and evaporated. Purification by flash chromatography (2.5×25 cm column, 1:4 EtOAc/hexane) provided the title compound as a white solid (1.32 g, 91% yield), mp 96-98 C.
89% A solution of <strong>[89942-77-8]methyl <strong>[89942-77-8]3-hydroxy-2-nitrobenzoate</strong></strong> (6.9 g, 0.033 mol) in dry DMF (100 ml) was cooled to 0 C under argon and treated with sodium hydride (0.96 g, 0.04 mol). The reaction mixture was stirred for 10 min and benzyl bromide (6.27 g, 0.036 mol) was added. The reaction mixture was allowed to warm to 25 C, and stirring was continued for an additional 20 h. A solution of saturated NaCl (30 ml) was added, and the reaction mixture was further diluted with H2O (100 ml). The aqueous layer was extracted with Et2O (4 150 ml). The combined ether extracts were washed with H2O (100 ml), washed with saturated NaCl (30 ml), dried over Na2SO4 and the solvent was removed in vacuum. Then CHCl3 was added (30 ml), and the solution was dried over Na2SO4 and evaporated in vacuum to yield methyl 3-(benzyloxy)-2-nitrobenzoate as yellow crystals (89% yield, 8.95 g). 1H NMR delta = 7.58 (dd, 1H, aromaticH), 7.23-7.45 (m, 7H, phenyl and aromatic Hs), 5.19 (s, 2H,PhCH2), 3.88 (CO2CH3, s, 3H).
  • 29
  • [ 67-56-1 ]
  • [ 602-00-6 ]
  • [ 89942-77-8 ]
YieldReaction ConditionsOperation in experiment
95% Intermediate A-15B: Methyl 3-hydroxy-2-nitrobenzoate To a 100 mL flask containing MeOH (60 mL) at 0 C. was slowly added thionyl chloride (9.96 mL, 137 mmol). The solution was stirred at 0 C. for 30 minutes, and then Intermediate A-15A (10 g, 54.6 mmol) was added. The reaction solution was heated to reflux for 6 hrs. The reaction mixture was concentrated to dryness to give a bright yellow residue. The crude product mixture was purified via silica gel chromatography (0% to 100% of EtOAC/heptane over 15 minutes, 80 g column) giving the desired product (10.2 g, 95% yield). HPLC: RT=1.75 min (H2O/MeOH with TFA, Sunfire C18 3.5 mum, 2.1*30 mm, gradient=4 min, wavelength=220 nm); MS (ES): m/z=220 [M+Na]+; 1H NMR (400 MHz, chloroform-d) delta 7.60 (dd, J=8.5, 7.4Hz, 1H), 7.33-7.22 (m, 5H), 7.10 (dd, J=7.5, 1.3Hz, 1H), 3.96 (s, 3H).
93% With thionyl chloride; at 20℃; for 9h;Heating / reflux; To a stirred mixture of methanol (55 mL) and thionyl chloride (3.19 mL, 43.7 mmol) was added 3-hydroxy-2-nitrobenzoic acid (5.0 g, 27.3 mmol). The reaction mixture was stirred at room temperature for 2 h, refluxed for 7 h then evaporated. Purification by flash chromatography (2.5×10 cm column, 1:3 EtOAc/hexane) gave the title compound as a light yellow solid (5.03 g, 93% yield), mp 114-116 C. LC/MS gave the correct molecular ion [(M-H)-=196] for the desired compound.
64% With hydrogenchloride; In water; for 8h;Reflux; Methyl 3-hydroxy 2-nitrobenzoate (1): Dry HCl was bubbled through the refluxing solution of 3-hydroxy 2-nitro benzoic acid (10 g, 0.055 mol) in 150 ml MeOH for 8 h. The solution was concentrated in high vacuum. Addition of H2O to the concentrated solution precipitated the methyl 3-hydroxy 2-nitro benzoic ester(64% yield, 6.9 g, 0.035 mol). 1H NMR delta = 7.07 (dd, 1H), 7.26 (m,1H), 7.58 (d, 1H), 3.94 (CO2CH3, s, 3H).
With sulfuric acid; for 48h;Reflux; Example 113 Bmethyl 3-hydroxy-2-nitrobenzoate; A solution of 3-hydroxy-2-nitrobenzoic acid (51 g) and con.H2SO4 (5 mL) in anhydrous methanol (450 mL) was heated to reflux for 48 hr. The mixture was concentrated to remove methanol, and the residue was partitioned between water (500 mL) and ethyl acetate (800 mL). The organic layer was washed with brine (300 mL), dried over anhydrous sodium sulfate, and concentrated to give crude compound. The crude product was purified by chromatography (silica gel, petroleum ether/ethyl acetate=40:1 to 5:1) to give methyl 3-hydroxy-2-nitrobenzoate (28 g) 1H-NMR (400 MHz, CDCl3) delta 3.8 (s, 3H), 7.32-7.34 (d, J=8.4 Hz, 1H), 7.39-7.41 (d, J=8.0 Hz, 1H), 7.48-7.52 (t, J=8.0 Hz, 1H), 11.37 (s, 1H); LC-MS (m/z) 198 [M+1]+.
With thionyl chloride; at 60℃; General procedure: 3-Hydroxybenzoic acid (10 mmol) and anhydrous methanol (20 mL) were added to a 100 mL dry eggplant-shaped flask. With stirring, thionyl chloride (25 mmol) was added dropwise 5-12 h at 60 C, and the reaction progress was tracked using TLC. After the reaction completion, excess thionyl chloride was removed under reduced pressure, and the system was slowly poured into 100 mL of icewater. The mixture was extracted with ethyl acetate (30 mL 3),the combined organic layer was dried over Na2SO4, concentrated under vaccum. The crude product 1 was used in the next step without further purification.

  • 30
  • [ 89942-77-8 ]
  • [ 23788-74-1 ]
  • methyl 3-((R)-2,2-dimethyl-1,3-dioxolan-4-ylmethyloxy)-2-nitrobenzoate [ No CAS ]
YieldReaction ConditionsOperation in experiment
With potassium carbonate; In 1-methyl-pyrrolidin-2-one; hexane; ethyl acetate; Step 2 To a solution of <strong>[89942-77-8]methyl <strong>[89942-77-8]3-hydroxy-2-nitrobenzoate</strong></strong> (1.97 g, 10 mmol) in N-methylpyrrolidinone (15 mL) was added (R)-2,2-dimethyl-1,3-dioxolan-4-ylmethyl p-tosylate (3.43 g, 1.2 eq.), and followed by K2CO3 (4.2 g, 3 eq.). After the mixture was heated at 96 C. overnight, was cooled to room temperature, quenched with H2O, and partitioned between H2O and EtOAc. The organic layer was separated, washed with H2O and NaCl (sat.), and then dried over Na2SO4. The crude product was purified on a silica gel column with 20% EtOAc in hexane to give methyl 3-((R)-2,2-dimethyl-1,3-dioxolan-4-ylmethyloxy)-2-nitrobenzoate as an oil (3.1 g).
  • 31
  • [ 602-00-6 ]
  • [ 18107-18-1 ]
  • [ 89942-77-8 ]
  • 32
  • [ 602-00-6 ]
  • [ 74-88-4 ]
  • [ 89942-77-8 ]
  • 33
  • [ 89942-77-8 ]
  • [ 34105-78-7 ]
  • 34
  • [ 89942-77-8 ]
  • [ 1429632-40-5 ]
  • 35
  • [ 89942-77-8 ]
  • [ 1429632-42-7 ]
 

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