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Chemical Structure| 83-38-5 Chemical Structure| 83-38-5

Structure of 83-38-5

Chemical Structure| 83-38-5

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Product Details of [ 83-38-5 ]

CAS No. :83-38-5
Formula : C7H4Cl2O
M.W : 175.01
SMILES Code : C1=CC=C(C(=C1Cl)C=O)Cl
MDL No. :MFCD00003307

Safety of [ 83-38-5 ]

GHS Pictogram:
Signal Word:Danger
Hazard Statements:H314
Precautionary Statements:P501-P260-P264-P280-P303+P361+P353-P301+P330+P331-P363-P304+P340+P310-P305+P351+P338+P310-P405
Class:8
UN#:1759
Packing Group:

Computational Chemistry of [ 83-38-5 ] Show Less

Physicochemical Properties

Num. heavy atoms 10
Num. arom. heavy atoms 6
Fraction Csp3 0.0
Num. rotatable bonds 1
Num. H-bond acceptors 1.0
Num. H-bond donors 0.0
Molar Refractivity 41.85
TPSA ?

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

17.07 Ų

Lipophilicity

Log Po/w (iLOGP)?

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

1.64
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

2.64
Log Po/w (WLOGP)?

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

2.81
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.

2.63
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

3.26
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

2.6

Water Solubility

Log S (ESOL):?

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

-2.97
Solubility 0.189 mg/ml ; 0.00108 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.

-2.65
Solubility 0.393 mg/ml ; 0.00224 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

-3.57
Solubility 0.0467 mg/ml ; 0.000267 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

Yes
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

Yes
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.

-5.49 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

2.0
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)

1.09

Application In Synthesis of [ 83-38-5 ]

* 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 [ 83-38-5 ]

[ 83-38-5 ] Synthesis Path-Downstream   1~17

  • 1
  • [ 83-38-5 ]
  • [ 25185-95-9 ]
YieldReaction ConditionsOperation in experiment
100% With pyridine; hydroxylamine hydrochloride; at 20℃; for 0.166667h; Hydroxylamine hydrochloride (6.6 g, 95.0 mmol) was added to a room temperature solution of 2,6-dichlorobenzaldehyde (11.1 g, 63.4 mmol) in pyridine (31.7 mL) giving a mild exotherm. After 10 minutes the excess pyridine was removed in vacuo and the residue was partitioned between Et20 and water. The organic layer was sequentially washed with saturated aqueous NH4CI, brine and the combined aqueous layers were back extracted with several small portions of Et^O. The combined organics extracts were dried over Na2S04, filtered and concentrated in vacuo to give 2,6-dichlorobenzaldehyde oxime (12.4 g, 65.3 mmol, 100% yield) as a white solid. The product was carried on to the next step without further purification. NMR (400MHz, CDCh) δ 8.39 (s, 1H), 7.92 (s, 1H), 7.40-7.36 (m, 2H), 7.27-7.22 (m, 1H).
100% With pyridine; hydroxylamine hydrochloride; at 20℃; for 0.166667h; Hydroxylamine hydrochloride (6.6 g, 95 mmol) was added to a room temperature solution of 2,6-dichlorobenzaldehyde (11.1 g, 63.4 mmol) in pyridine (31.7 mL) giving amild exotherm. After 10 minutes the excess pyridine was removed in vacuo and the residue was partitioned between Et20 and water. The organic layer was sequentially washed with saturated aqueous NH4C1, brine and the combined aqueous layers were back extracted with several small portions of Et20. The combined organic extracts were dried over Na2504, filtered and concentrated in vacuo to give 2,6-dichlorobenzaldehyde oxime (12.4 g, 65.3mmol, 100% yield) as a white solid. The product was carried on to the next step without further purification. ‘H NMR (400MHz, CDC13) 8.39 (s, 1H), 7.92 (s, 1H), 7.40-7.36 (m, 2H), 7.27-7.22 (m, 1H).
100% With pyridine; hydroxylamine hydrochloride; at 20℃; for 0.166667h; Hydroxylamine hydrochloride (6.6 g, 95 mmol) was added to a room temperature solution of 2,6-dichlorobenzaldehyde (11.1 g, 63.4 mmol) in pyridine (31.7 mL) giving a mild exotherm. After 10 minutes the excess pyridine was removed in vacuo and the residue was partitioned between Et2O and water. The organic layer was sequentially washed with saturated aqueous NH4Cl, brine and the combined aqueous layers were back extracted with several small portions of Et2O. The combined organic extracts were dried over Na2SO4, filtered and concentrated in vacuo to give a 2,6-dichlorobenzaldehyde oxime (12.4 g, 65.3 mmol, 100% yield) as a white solid. The product was carried on to the next step without further purification. 1H NMR (400 MHz, CDCl3) δ 8.39 (s, 1H), 7.92 (s, 1H), 7.40-7.36 (m, 2H), 7.27-7.22 (m, 1H).
99% With sodium hydroxide; hydroxylamine hydrochloride; In ethanol; water; at 90℃;Product distribution / selectivity; Example 32; 6-{4-[5-Cvclopropyl-3-(2,6-dichloro-phenyl)-isoxazol-4-ylmethoxy1-piperidin-l-yl}-l- methyl-1 H-indole-3 -carboxylic acid; <n="56"/>Step l; 2.6-Dichloro-benzaldehyde oxime; Sodium hydroxide 3N (3.14L, 9.43mol) is added dropwise to a stirred suspension of hydroxylamine hydrochloride (675.55g, 9.43mol) in 0.5L of water at O0C. To this mixture is added dropwise a suspension of 2,6-dichlorobenzaldehyde (150Og, 8.57mol) in 7.5L of ethanol and the reaction is heated at 9O0C overnight. The mixture is cooled to room temperature and then, concentrated to dryness. The solid is triturated in a mixture of H2O/EtOH, 10: 1 (4.4L), filtered and dried under high vacuum at 450C overnight. 1621.78g of title compound (99% yield) is obtained as a white solid. MS (m/e): 190 (M+ 1)
98% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 0 - 90℃; for 24h; To a solution of NH2OH·HCl (10.9 g, 0.157 mol) in water (100 mL) was added NaOH (6.27 g, 0.157 mol) at 0 C. The resulting solution was then added to a solution of 1 (25.0 g, 0.142 mol) in ethanol (200 mL). The resulting mixture was stirred at 90C for 24 h. The reaction mixture was concentrated under reduced pressure. The solids were collected by filtration and washed with water to give 2 (26.5 g, 98%) as a white compound which was used in the next step without further purification.
98% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; Hydroxylamine hydrochloride (67.6 g, 0.943 mol) was dissolved in 100 mL of water, and sodium hydroxide 3N was added dropwise under stirring at 0 C.(314 mL, 9.43 mol. 2,6-dichlorobenzaldehyde (150 g, 0.857 mol) was added to ethanol (300 mL) to dissolve, and the mixture solution was added dropwise, and then the temperature was raised to 90 C. and stirred overnight.The reaction was monitored by thin layer chromatography (TLC). After the reaction was completed, it was cooled to room temperature and concentrated in vacuo to a 10% solution.The solid was obtained by suction filtration and dried to obtain 162 g of a white solid.Yield: 98%.
97% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 0 - 90℃; To a 2 L round-bottom flask containing hydroxylamine hydrochloride (108 g, 1.55mol, 1.3 equiv.), sodium hydroxide (60 g, 1.50 mol, 1.3 equiv.), and water (200 mL) was5 added 2,6-Dichlorobenzaldehyde 1a (200 g, 1.14 mol, 1.0 equiv.) dropwise at 0 C, folov,'edby ethanol (500 mL). The resulting rnixture was heated at 90 C ovemight, and thenconcentrated under reduced pressure. The resulting solids were collected by filtration anddried in an oven tmder reduced pressure, to provide 210 g (97%) of N-[ (2,6-dichlorophenyl)methylidene]-hydroxy lamine l bas an ofi-white solid.
96% With sodium hydroxide; hydroxylamine hydrochloride; In ethanol; water; at 90℃; for 24h; A solution of 2, 6-DICHLOROBENZA . DEHYDE (25g, 0.14 mole) in ethanol (200 mL) was added to a solution of HYDROXYLAMINE HYDROCHLORIDE (11G, 0.16 mole) and sodium hydroxide (6.3g, 0.16 mole) in water (100 mL). The resulting mixture was stirred at 90 C for 24 hours. The volume was reduced in vacuo by ca 30 mL which induced a precipitate. The flask was then cooled to room temperature and the white solids were collected by filtration and washed with water (2x 100 ML). Yield = 25.9g. (96%) of 2, 6-DICHLOROBENZALDEHYDE oxime.
96% With sodium hydroxide; hydroxylamine hydrochloride; In ethanol; water; at 90℃; for 24h; A solution of 2,6-dichlorobenzaldehyde (25 g, 0.14 mole) in ethanol (200 mL) was added to a solution of hydroxylamine hydrochloride (11 g, 0.16 mole) and sodium hydroxide (6.3 g, 0.16 mole) in water (100 mL). The resulting mixture was stirred at 90° C. for 24 hours. The volume was reduced in vacuo by ca 30 mL which induced a precipitate. The flask was then cooled to room temperature and the white solids were collected by filtration and washed with water (2 100 mL). Yield=25.9 g. (96%) of 2,6-dichlorobenzaldehyde oxime. A 500 mL round bottom flask was charged with a solution of 2,6-dichlorobenzaldehyde oxime (13 g, 0.07 mole) in N,N-dimethyl formamide (150 mL). The flask was placed in an ambient temperature water bath. The flask was then charged with N-chlorosuccinimide (9.2 g, 0.07 mole). Within minutes of dissolution, an exotherm was observed along with a significant color change to dark yellow. The reaction was stirred an additional hour then the contents were then poured into water (200 mL) and the product extracted with diethyl ether (300 mL). The ethereal layer was washed with water (3 100 mL) and brine (50 mL), then dried over anhydrous magnesium sulfate. After filtering, the solvent was removed in vacuo to yield 14.5 g of a yellow oil. (94%) of 2,6-dichlorophenyl hydroximic chloride which was used without further purification. A stirred solution of methyl isobutyryl acetate (2 g, 15.6 mmol) in tetrahydrofuran (15 mL) was treated with a solution of sodium methoxide (31.5 mL, 0.5 M in methanol) followed by a solution of 2,6-dichlorophenyl hydroximic chloride (3.5 g, 15.6 mmol) in tetrahydrofuran (5 mL). After stirring at ambient temp 16 h the solvent was removed in vacuo. The resulting residue was partitioned with diethyl ether (100 mL) and water (100 mL). The ethereal layer was washed with brine (50 mL), dried over anhydrous magnesium sulfate, filtered and condensed to an oil. The product was purified by flash chromatography on silica gel using 10% ethyl acetate in hexane as mobile phase. Yield=3.1 g. (62%) of 3-(2,6-dichlorophenyl)-4-carbomethoxy-5-isopropyl-isoxazole.
96% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; for 24h; A solution of 2,6-dichlorobenzaldehyde A1a (25 g, 0.14 mol) in 200 mL of ethanol was added to a solution of hydroxylamine hydrochloride (11 g, 0.16 mol) and sodium hydroxide (6.3 g, 0.16 mol) in 100 mL of water. The resulting mixture was stirred at 90C for 24 h. The volume was reduced in vacuum by - 30 mL, which induced a precipitate. The flask was then cooled to room temperature and the solid was collected by filtration and washed with water (2 x 100 mL). The solid was dried under vacuum to give 25.9 g of compound A2a (white solid, yield: 96%).
96.5% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; A 3 mol / L sodium hydroxide solution (21 ml, 0.063 mol, 1.1 eq) was added dropwise to a suspension of 3.3 ml of water in hydroxylamine hydrochloride (4.37 g, 0.063 mol, 1.1 eq). The mixed solution was poured into a mixed solution of 50 ml of ethanol and 2,6-dichlorobenzaldehyde (10 g, 0.057 mol, 1.0 eq), and the mixture was heated to 90 C overnight. The reaction solution was concentratedDry, concentrated dry solid was added 29.3 ml (H2O: EtOH = 10: 1) solution, filtered and crystallized,The filter cake was dried and dried in vacuo at 45 C to give intermediate 1-8, 10.48 g as a white solid, 96.5% yield.
96.5% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; At 0 C, 3 mol/L sodium hydroxide solution (21 ml, 0.063 mol, 1.1 eq) was dropped into suspended 3.3 ml waterA solution of hydroxylamine hydrochloride (4.37 g, 0.063 mol, 1.1 eq).The mixed solution was added dropwise to a mixed solution of 50 ml of ethanol and 2,6-dichlorobenzaldehyde (10 g, 0.057 mol, 1.0 eq), and the mixture was heated to 90 C overnight.After the completion of the reaction, the reaction solution was concentrated to dryness, and then concentrated, dried solid was added to a solution of 29.3 ml (H2O:EtOH=10:1).After beating and crystallization, the filter cake was drained and dried under vacuum at 45 C.Intermediate 1-8 was obtained as a white solid 10.48 g, yield 96.5%.
96.5% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; for 24h; Hydroxylamine hydrochloride (10.9g) and sodium hydroxide (6.27g) were dissolved in water at room temperature.Add dropwise to a solution of 2,6-dichlorobenzaldehyde (25 g) in ethanol (200 mL).Stir at 90 degrees for 24 hours.Cool to room temperature,Spin dry ethanol,filter,Wash the filter cake with water,The product was dried under infrared light to obtain 26.5 g of a product.The yield was 96.5%.
96% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; for 24h; Sodium hydroxide(6.3g, 160mmol) and 2,6-dichlorobenzaldehyde(25g, 140mmol) in ethanol(200ml) was added to hydroxylamine hydrochloride(11g, 160mmol) in water(100ml) and stirred for 24 hours at 90 . The reaction mixture was evaporated in vacuum, filtered with water(200ml, 2 times) and dried in vacuum to afford the intermediate compound 2,6-dichlorobenzaldehyde oxime(25.9g, 96%). [585] 1H-NMR (DMSO, 400MHz): δ 11.80 (s, 1H), 8.22 (s, 1H), 7.55 (d, 2H), 7.45-7.41 (dd, 1H).
96% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; for 24h; Hydroxylamine hydrochloride (11 g, 160 mmol) was added to a solution of to distilled water (100 ml) and sodium hydroxide (6.3 g, 160 mmol) and 2,6-Dichlorobenzoaldehyde (25 g, 140 mmol) was added to a solution of Dissolved in ethanol (200 ml) was added, and the mixture was stirred at 90 C for 24 hours.The reaction mixture was concentrated and the resulting solid was washed with distilled water (200 ml, twice) and dried to give the intermediate compound 2,6-dichlorobenzaldehyde oxime (25.9 g, 96%) was obtained.
94% With hydroxylamine hydrochloride; triethylamine; In dichloromethane; for 8h;Product distribution / selectivity; Alternate procedure: Add triethylamine (23.1 g, 229 mmol) dropwise to a solution of 2,6-dichloro-benzaldehyde (20.0 g, 114 mmol) and hydroxylamine hydrochloride (10.3 g, 149 mmol) in dichloromethane (200 mL). Stir the reaction mixture for 8 h. Add water (200 mL). Separate the phases and extract the aqueous phase with dichloromethane (100 mL). Wash the combined organic phases with water (100 mL). Concentrate the combined organic phases to provide 28.8 g (94%) of the title compound.
89% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; 2,6-dichlorobenzaldehyde (611) (25g,0.14mol) was dissolved in 200mL ethanol, Followed by addition hydroxylamine hydrochloride (0.16 mol)And 6.3 g of sodium hydroxide (0.16 mol) in 100 mL of an aqueous solution.Then the system temperature to 90 C,After the reaction at this temperature for 2-3 h, TLC detection reaction.After the reaction, The solvent was evaporated to about 30 mL, and a large amount of solid was precipitated. The solid was washed with water and dried to give 24 g of product 2,6-dichlorobenzyloxime (AI) (89%).
85% With pyridine; hydroxylamine hydrochloride; In ethanol; at 0℃;Reflux; 2,6-dichlorobenzaldehyde (25 gm, 0.143 moles, 1 eq) was dissolved in EtOH (200 ml) followed by the addition of hydroxyl amine hydrochloride (19.9 gm, 0.286 moles, 2 eq) and pyridine (34 gm, 0.429 moles, 3 eq) at 00C. The reaction mixture was refluxed for 40 minutes and checked by TLC. The solvent was removed under reduced pressure and to the residue water was added and extracted with ethyl acetate twice. The combined organic layer was washed with brine, dried over Na2SO4, concentrated and washed with chilled hexane to afford the mixture of syn and anti oxime b in 85% yield (23 gm). MS 190.0 (M+ peak) 1H NMR (200 MHz, CDCl3): δ 7.20-7.30 (m, 3H), 7.38-4.00 (m, 3H), 8.20 (s, IH), 8.40 (s, IH) mixture of syn and anti isomers.
85% With pyridine; hydroxylamine hydrochloride; In ethanol; at 0℃; for 0.666667h;Reflux; 2,6-dichlorobenzaldehyde (25 gm, 0.143 moles, 1 eq) was dissolved in EtOH (200 ml) followed by the addition of hydroxyl amine hydrochloride (19.9 gm, 0.286 moles, 2 eq) and pyridine (34 gm, 0.429 moles, 3 eq) at 00C. The reaction mixture was refluxed for 40 minutes and checked by TLC. The solvent was removed under reduced pressure and to the residue water was added and extracted with ethyl acetate twice. The combined organic layer was washed with brine, dried over Na2SO4, concentrated and washed with chilled hexane to afford the mixture of syn and anti oxime b in 85% yield (23 gm). MS 190.0 (M+ peak) 1H NMR (200 MHz, CDCl3): δ 7.20-7.30 (m, 3H), 7.38-4.00 (m, 3H), 8.20 (s, IH), 8.40 (s, IH) mixture of syn and anti isomers.
78% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 90℃; for 16h; 3N Sodium hydroxide (8.35 g, 0.208 mol) was added drop wise to a solution of hydroxylamine hydrochloride (l4.5lg, 0.208 mol) in water (130 ml) at 0 C . A solution of 2, 6-dichloro-benzaldehyde (32.0g, 0.182 mol) in ethanol (250 ml) was then added and the reaction mixture heated at 90 C for 16 h. The mixture was then cooled to room temperature, concentrated to dryness and the crude product triturated with 10:1 water/EtOH, filtered and dried under reduced pressure to afford the titled compound as a solid (27.0 g, 78 % yield). 'H NMR (400 MHz, d6-DMSO): d 11.79 (s, 1H), 8.22 (s, 1H), 7.60-7.38 (m, 3H).
64% With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; at 90℃; 2,6-Dichlorobenzaldehyde (5.0 g, 28.6 mmol) is dissolved in anhydrous ethanol (45 ml), and the mixture is stirred at room temperature, followed by adding NH2OH·HCl (2.3 g, 33.1 mmol), NaOH (1.3 g, 32.5 mmol) and water (20 mL) with overnight reflux in an oil bath at 90 C.When the reaction mixture is cooled to room temperature, the mixture is rotated to remove solvents, followed by adding water (100 mL), and then it is extracted with ethyl acetate (2 * 100 mL), then the organic solution is combined and washed with saturated salt water (2 * 100 mL), and then is dried with anhydrous Na2SO4, then filtered and rotated to dryness, after that, adding petroleum ether (100 mL), and stirring well, finally the product is filtered and dried, so that a white solid, that is 2,6-dichlorobenzaldehyde oxiame, is obtained with a yield of 64%.
With sodium hydroxide; water; In methanol; Step 1 2.6-Dichloro-bcnzaldchvdc oximc2,6-Dichloro-benzaldelryde (7.0 g,40 mmol) is added to 10 mL of water and 30 mL of methanol. Sodium hydroxide (4.0 g, 100 mmol) is dissolved in 8 mL of water slowly. The sodium hydroxide solution <n="12"/>is added to the benzaldelαyde solution. The reaction is stirred overnight. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is washed with brine and dried over solid sodium sulfate. The organic layer is filtered and the solvent is removed under reduced pressure to yield the title compound.
With sodium hydroxide; hydroxylamine hydrochloride; In ethanol; water; at 20℃; for 1h; BY THE GENERAL PROCEDURE OF R. K. HOWE, ET AL, J. ORG. CHEM., 1980,45, 3916-3918 the aldehyde starting material 245 in 1: 1 ethanol-water was treated with 1.1 equivalents of hydroxylamine hydrochloride and 2.5 equivalents of aqueous sodium hydroxide with cooling. The mixture was then stirred at room temperature for LH. The reaction mixture was extracted with ether, which was discarded and the aqueous layer was separated and acidified to pH 6 with concentrated hydrochloric acid with cooling. The aqueous layer was extracted with ether and the ether layers were separated. The combined ether layers were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired solid oximes.
With pyridine; hydroxylamine hydrochloride; at 20℃; Referring to Fig. 3A, the aldehyde starting material 245 was dissolved in pyridine solvent, and 1.0-1. 2 equivalents of solid hydroxylamine hydrochloride was added in one portion and the homogeneous mixture was stirred overnight at room temperature. The mixture was concentrated under reduced pressure. The residue was dissolved in ethyl acetate and this solution was washed with either 1N hydrochloric acid followed by saturated brine, or by saturated brine alone. The ethyl acetate solution was then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to yield the desired oxime, 247
With sodium hydroxide; hydroxylamine hydrochloride; In methanol; water;Product distribution / selectivity; Intermediate Preparation 2; 2,6-Dichloro-benzaldehyde oxime; 2,6-Dichloro-benzaldehyde (7.0 g, 40 mmol) and hydroxylamine hydrochloride (2.16 g, 44 mmol) are added to 10 mL of water and 30 mL of methanol. Sodium hydroxide (4.0 g, 100 mmol) is dissolved in 8 mL of water slowly. The sodium hydroxide solution is added to the benzaldehyde solution. The reaction is stirred overnight. The reaction mixture is partitioned between ethyl acetate and water. The organic layer is washed with brine and dried over solid sodium sulfate. The organic layer is filtered and the solvent is removed under reduced pressure to yield the title compound.
With hydroxylamine hydrochloride; In water; at 20℃; for 0.5h;Green chemistry; General procedure: The aqueous solution of hydroxylamine hydrochloride (1.2 mmol) and aldehyde 2 (1 mmol) were stirred at room temperature for 30 min. After complete conversion of aldehyde to oxime, N-chlorosuccinamide (1.3 mmol) was added to the reaction mixture and was allowed to stir for 3 h. The clay-Cu(II)/NaN3 mixture (prepared by stirring 15 mol % clay-Cu catalyst and 7.5 mol % NaN3 in water until the color changes from brown to black) and phenyl acetylene 5a (1.3 mmol) was added and the reaction mixture was further stirred for another 3 h. After completion of reaction, the reaction mixture was filtered through Whatman filter paper, residue was washed with EtOAc. Organic layer was separated from filtrate and was dried over anhydrous sodium sulfate. Combined organic layers were concentrated in vacuo and crude reaction mixture was purified by silica gel (100-200) column chromatography using EtOAc: hexane as eluting solvent to get corresponding 3,5-disubstituted isoxazoles 1a-1o in 68-88% yield.
With hydroxylamine hydrochloride; sodium hydroxide; In ethanol; water; at 0 - 90℃; To a 2 L round-bottom flask containing hydroxylamine hydrochloride (108 g, 1.55 mol, 1.3 equiv.), sodium hydroxide (60 g, 1.50 mol, 1.3 equiv.), and water (200 mL) was added 2,6- dichlorobenzaldehyde la (200 g, 1 .14 mol, 1.0 equiv,), followed by ethanol (500 mL) at 0 C. The resulting mixture was stirred at 90 C overnight and then concentrated in vacuo. The resulting solids were collected by filtration and dried in an oven under reduced pressure, providing N-[(2,6-dichlorophenyl)methylidene]-hydroxylamine lb (210 g, 97%) as an off-white solid. The product was carried onto the next step without further purification.
With hydroxylamine hydrochloride; sodium hydroxide; In water; at 83℃; for 3h;pH &#60; 9.5; A solution of hydroxylamine hydrochloride (0.25 M) was prepared and sufficient quantity of water was added in order to keep the pH of solution below 2.5 and temperature of the solution below 25C. To this solution NaOH was added in order to keep the temperature below 50C and pH of the solution below 9.5. To this warm solution was slowly added 2,6-dichlorobenzaldehyde by keeping temperature below 83C. When addition of aldehyde was over, crystalline product formation was observed within 2-3 minutes. Reaction progress was monitored by TLC. Reaction was completed within 3 hours. Reaction mass was filtered and was dried in oven to obtain crystalline 2,6-dichlorobenzaldehyde oxime of formula VIII.

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  • 2
  • [ 20605-41-8 ]
  • [ 83-38-5 ]
  • [ 128153-79-7 ]
  • 3
  • [ 83-38-5 ]
  • [ 22259-53-6 ]
  • [1-(2,6-Dichloro-phenyl)-meth-(E)-ylidene]-(1H-indol-3-ylmethyl)-amine [ No CAS ]
  • 5
  • [ 2040-05-3 ]
  • [ 83-38-5 ]
  • [ 203115-70-2 ]
  • 6
  • [ 25185-95-9 ]
  • [ 83-38-5 ]
YieldReaction ConditionsOperation in experiment
83% With citric acid; In water monomer; for 0.166667h;Microwave irradiation; Green chemistry; General procedure: A mixture of 0.2 mmol phenylhydrazone,semicarbazones or oximes and citric acid(0.2 mmol) were mixed together in water (10 mL)was introduced in a 50 mL Erlenmeyer ask and wasplaced in a commercial microwave oven operatingat a power output of 300 W and irradiated for theappropriate time in 30 seconds intervals each.(Table 3). The reaction was monitored by TLC.The product extracted with Chloroform, dried overanhydrous Na2SO4, flter and was chromatographed on silica gel (eluted by ethyl acetate: hexane 2:8)to afford the corresponding products in good toexcellent yields (Table 3). All the products werecharacterized by their physical constants, IR, NMRspectra and comparison with authentic samples.The phenylhydrazones, semicarbazones and oximeswere prepared by standard procedures32.
With oxygen; benzaldehyde; In toluene; for 2h;Catalytic behavior; General procedure: In this procedure, a suspension of the heterogeneous catalyst(0.07 g), solvent (5 cm3of toluene), oxime (2 mmol) and benzalde-hyde (6 mol) were mixed in a three necked round bottom flaskwhich was fitted with a equipped water condenser with a balloonfilled of O2. The liquid phase oxidation reactions were carried outat desired temperature with vigorous stirring. After completing thereaction, the catalyst has been separated through filtering and theproducts and the amounts of them have been quantified by GC-MSand GC. Finally, a suitable reaction condition has been optimized.
With oxygen; benzaldehyde; In toluene; for 2.16667h;Reflux; General procedure: In this procedure, a suspension of the heterogeneous catalyst(0.15 g), solvent (5 cm3of toluene), oxime (2 mmol) and benzalde-hyde (10 mol) were mixed in a three necked round bottom flaskwhich was fitted with a equipped water condenser with a balloonfilled of O2. The liquid phase oxidation reactions were carried outat desired temperature with vigorous stirring. After completing thereaction, the catalyst has been separated through filtering and theproducts and the amounts of them have been quantified by GC-MSand GC. Finally, a suitable reaction condition has been optimized
With oxygen; benzaldehyde; In phenyl cyanide; toluene; at 60℃; for 1.91667h;Green chemistry; General procedure: The heterogeneous aerobic oxidation of oximes were done in 3-necked round-bottom flask fitted with condenser and O2 balloonusing Mn(II)-MetMMNPs. In typical reaction catalyst (140 mg),solvent (5 mL), oxime (2 mmol) and benzaldehyde (5 mmol) weremixed under O2 bubbling and stirred at desired temperature. Atthe end of the reaction, the magnetic catalyst has been separatedand products have been quantified by GC and GC-Mass throughbeing compared with authentic samples. Furthermore, the effectivevarious parameters in catalytic oxidation reaction were examinedin order to achieve highest conversion and selectivity.
With oxygen; benzaldehyde; In toluene; at 50℃; for 1.66667h;Catalytic behavior; General procedure: The dendritic catalyst (0.07g), toluene (TOL, 5mL), aldoxime/ketoxime (2mmol), and Bz (5mmol) were placed in a three-necked flask with magnetic stirring. The vessel was fitted with an equipped water condenser with a balloon filled with O2 at a specific time & temperature (Table 3). After completion of the reaction, the dendritic catalyst has been isolated by magnet stick and the AH/KO and the amounts of them have been calculated by GC & GC-MS analysis. Eventually, a favorable catalytic oxygenation condition has been assessed.

  • 7
  • (5-bromo-2-imino-2<i>H</i>-pyridin-1-yl)-acetic acid methyl ester; hydrobromide [ No CAS ]
  • [ 1709-59-7 ]
  • [ 83-38-5 ]
  • 4-[6-(2,6-dichloro-benzoyl)-imidazo[1,2-<i>a</i>]pyridin-2-ylamino]-<i>N</i>,<i>N</i>-dimethyl-benzenesulfonamide [ No CAS ]
  • 8
  • (5-bromo-2-imino-2<i>H</i>-pyridin-1-yl)-acetic acid methyl ester; hydrobromide [ No CAS ]
  • [ 35216-39-8 ]
  • [ 83-38-5 ]
  • (2,6-dichloro-phenyl)-[2-(3-methanesulfonyl-phenylamino)-imidazo[1,2-<i>a</i>]pyridin-6-yl]-methanone [ No CAS ]
  • 10
  • [ 83-38-5 ]
  • [ 2040-05-3 ]
  • 11
  • [ 4214-57-7 ]
  • [ 83-38-5 ]
  • [ 68-11-1 ]
  • [ 1171120-26-5 ]
  • 12
  • [ 7474-78-4 ]
  • [ 83-38-5 ]
  • [ 1217433-13-0 ]
  • 13
  • [ 19012-02-3 ]
  • [ 83-38-5 ]
  • [ 1344706-42-8 ]
YieldReaction ConditionsOperation in experiment
With potassium hydroxide; In water; at 60℃; for 12h; General procedure: To a solution of N-methyl-3-acetylindol (1 mmol) and the benzaldehyde derivative (1 mmol) in methanol (10 ml) was added KOH (1 ml from a 50% solution in H2O). The mixture was heated at 60 C for 12 h then evaporated to dryness. The crude was dissolved in ethyl acetate (30 ml) then washed with HCl (1N, 10 ml) and H2O (10 ml), respectively. The organic layer was separated, dried over Na2SO4 and evaporated. The product was purified by chromatography column eluted with hexane:ethyl acetate (8:2) to yield the title compound as a yellow powder.
  • 14
  • [ 38956-79-5 ]
  • [ 83-38-5 ]
  • 3-(2,6-dichlorophenyl)-6-methyl[1,2,4]triazolo[4,3-b]pyridazine [ No CAS ]
  • 15
  • [ 38956-79-5 ]
  • [ 83-38-5 ]
  • C12H10Cl2N4 [ No CAS ]
YieldReaction ConditionsOperation in experiment
In ethanol; at 60℃; for 0.5h; General procedure: A mixture of corresponding hydrazinylpyridazine 1 or 5 (1 mmol) and aldehyde 2 (1.1 mmol) in ethanol (5 mL) was heated at 60 oC for 0.5 h. The formation of hydrazone was checked by TLC and the reaction mixture was cooled to rt. Oxone (1.5 mmol) was added to the mixture at rt followed by tetramethyl ammonium bromide (0.2 mmol) and the resulting mixture was heated at 60 oC for another 5 h. The mixture was cooled to rt and extracted with dichloromethane (2 × 25 mL), dried over anhydrous sodium sulphate and concentrated to obtain a residue which was purified by column chromatography using hexane/ethyl acetate as eluent to furnish the desired triazolopyridazines 4 and 7.
In ethanol; at 60℃; for 0.5h; General procedure: A mixture of corresponding hydrazinylpyridazine 1 or 5 (1 mmol) and aldehyde 2 (1.1 mmol) in ethanol (5 mL) was heated at 60 C for 0.5 h. The formation of hydrazone was checked by TLC and the reaction mixture was cooled to rt. Oxone (1.5 mmol) was added to the mixture at rt followed by tetramethyl ammonium bromide (0.2 mmol) and the resulting mixture was heated at 60 C for another 5 h. The mixture was cooled to rt and extracted with dichloromethane (2 × 25 mL), dried over anhydrous sodium sulfate and concentrated to obtain a residue which was purified by column chromatography using hexane/ethyl acetate as eluent to furnish the desired triazolopyridazines 4 and 7 (See reference no; 7 for supporting information).
  • 16
  • [ 83-38-5 ]
  • [ 78364-55-3 ]
  • 2-(2-(2,6-dichlorobenzylidene)hydrazino)-6-fluorobenzothiazole [ No CAS ]
YieldReaction ConditionsOperation in experiment
72% With acetic acid; In ethanol; at 80℃; for 0.166667h;Microwave irradiation; General procedure: A mixture of compound 2 (0.0549 g, 0.0003 mol), the appropriate aromatic aldehyde (0.00033 mol) and glacial acetic acid (0.1 mL) in ethanol (5 mL) was heated under microwave (20 W) at 80 °C for 10 min. On cooling, the precipitated solid was collected by filtration, washed with water, dried and crystallized to give compounds 3-29.
  • 17
  • [ 1076-38-6 ]
  • [ 83-38-5 ]
  • [ 145091-87-8 ]
  • C20H14Cl2N2O4 [ No CAS ]
YieldReaction ConditionsOperation in experiment
In ethanol; water monomer;Reflux; General procedure: To an equimolar mixture of two reagents ethyl acetoacetate 1 (5 mmol) and hydrazine hydrate 2 (5 mmol) in the presence of SDBS as a catalyst (x mol%) was added EtOH-H2O (1:1, 5 mL) in a 250 mL round-bottom tricol flask equipped with a condenser and heated in a refluxing sand bath under stirring. After the for- mation of the pyrazolone product (monitored by TLC), the aromatic aldehyde derivative 3a-i (5 mmol) and the 4-hydroxycoumarin derivative 4 (5 mmol) were added simultaneously to the reaction mixture after dissolving them in 5 mL of ethanol separately and finally supplemented with 10 mL of water. The resulting mixture was stirred under reflux conditions and the progress of the reac- tion was monitored by TLC. After completion of the reaction, the mixture was filtered directly under heat. Then the products were washed with a hot ethanol-H2O (1:1) mixture and dried at room temperature to give the corresponding benzylpyrazolyl-coumarin derivatives 5a-i . All products were identified by melting point mea- surement and the structure of compound 5a was confirmed by mass and NMR spectroscopic methods.
 

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