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Product Details of [ 6630-33-7 ]

CAS No. :6630-33-7 MDL No. :MFCD00003300
Formula : C7H5BrO Boiling Point : -
Linear Structure Formula :- InChI Key :NDOPHXWIAZIXPR-UHFFFAOYSA-N
M.W :185.02 Pubchem ID :81129
Synonyms :

Calculated chemistry of [ 6630-33-7 ]

Physicochemical Properties

Num. heavy atoms : 9
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 : 39.53
TPSA : 17.07 Ų

Pharmacokinetics

GI absorption : High
BBB permeant : Yes
P-gp substrate : No
CYP1A2 inhibitor : Yes
CYP2C19 inhibitor : No
CYP2C9 inhibitor : No
CYP2D6 inhibitor : No
CYP3A4 inhibitor : No
Log Kp (skin permeation) : -5.73 cm/s

Lipophilicity

Log Po/w (iLOGP) : 1.73
Log Po/w (XLOGP3) : 2.39
Log Po/w (WLOGP) : 2.26
Log Po/w (MLOGP) : 2.21
Log Po/w (SILICOS-IT) : 2.68
Consensus Log Po/w : 2.25

Druglikeness

Lipinski : 0.0
Ghose : None
Veber : 0.0
Egan : 0.0
Muegge : 2.0
Bioavailability Score : 0.55

Water Solubility

Log S (ESOL) : -2.92
Solubility : 0.222 mg/ml ; 0.0012 mol/l
Class : Soluble
Log S (Ali) : -2.39
Solubility : 0.754 mg/ml ; 0.00408 mol/l
Class : Soluble
Log S (SILICOS-IT) : -3.2
Solubility : 0.117 mg/ml ; 0.000634 mol/l
Class : Soluble

Medicinal Chemistry

PAINS : 0.0 alert
Brenk : 1.0 alert
Leadlikeness : 1.0
Synthetic accessibility : 1.0

Safety of [ 6630-33-7 ]

Signal Word:Warning Class:N/A
Precautionary Statements:P261-P305+P351+P338 UN#:N/A
Hazard Statements:H315-H319-H335 Packing Group:N/A
GHS Pictogram:

Application In Synthesis of [ 6630-33-7 ]

* 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.

  • Upstream synthesis route of [ 6630-33-7 ]
  • Downstream synthetic route of [ 6630-33-7 ]

[ 6630-33-7 ] Synthesis Path-Upstream   1~91

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Reference: [1] Heterocycles, 1986, vol. 24, # 8, p. 2311 - 2314
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  • [ 50-01-1 ]
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Reference: [1] Synthesis, 2009, # 16, p. 2679 - 2688
  • 3
  • [ 1692-25-7 ]
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  • [ 176690-44-1 ]
YieldReaction ConditionsOperation in experiment
64% With sodium carbonate In water; N,N-dimethyl-formamide at 110℃; Inert atmosphere Example 380 : Synthesis of (1E,6E)-1-(4-hydroxyphenyl)-7-[2-(pyridin-3-yl)phenyl]hepta-1,6-diene-3,5-dione (CU513); (1) Synthesis of 2-(pyridin-3-yl)benzaldehyde; To a suspension of 1-bromobenzaldehyde (250 μL, 2.14 mmol), sodium carbonate (270 mg, 2.55 mmol), and 3-pyridineboronic acid (289 mg, 2.35 mmol) in 4.2 mL of N,N-dimethylformamide/water (2:1) were added palladium acetate (24 mg, 0.11 mmol) and triphenylphosphine (115 mg, 0.44 mmol) under nitrogen. After being stirred at 110°C overnight, the reaction mixture was filtered. The filtrate was diluted with chloroform, and the solution was washed with brine, and dried over MgSO4. After filtration, the filtrate was concentrated in vacuo, and the residue was purified by silica gel column chromatography (chloroform/methanol = 99/1 to 95/5) to obtain the title compound as a white powder (250 mg, 64percent).
Reference: [1] Patent: EP2123637, 2009, A1, . Location in patent: Page/Page column 106
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Reference: [1] Patent: WO2008/130970, 2008, A1, . Location in patent: Page/Page column 102-103
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  • [ 637-81-0 ]
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Reference: [1] Patent: US2002/68756, 2002, A1,
  • 6
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Reference: [1] Journal of Organic Chemistry, 2003, vol. 68, # 15, p. 6011 - 6019
  • 7
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  • [ 7073-69-0 ]
Reference: [1] Organic Letters, 2012, vol. 14, # 2, p. 628 - 631
  • 8
  • [ 75-16-1 ]
  • [ 6630-33-7 ]
  • [ 7073-69-0 ]
Reference: [1] Advanced Synthesis and Catalysis, 2014, vol. 356, # 16, p. 3415 - 3421
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YieldReaction ConditionsOperation in experiment
49.8%
Stage #1: for 3 h; Inert atmosphere; Reflux; Dean-Stark
Stage #2: With aluminum (III) chloride In dichloromethane at 0 - 45℃; for 2 h; Inert atmosphere
A mixture of 2-bromobenzaldehyde (50 g, 270 mmol) , aminoacetaldehyde dimethyl acetal (28.4 g, 270 mmol) and toluene (400 mL) was refluxed under argon. Dehydration was carried out using dean stark for 2.0 hours. After removal of calculated amount of water, the reflux was continued for 1.0 hour. The toluene was evaporated under reduced pressure, the residue was dissolved in dichloromethane (600 mL) , and the solution was cooled to 0°C. To the cooled solution was slowly added aluminium chloride (118.9 g, 891.7 mmol) under argon. The reaction mixture was stirred at 45°C for 2.0 hours. After the completion of the reaction was confirmed by TLC, the mixture was cooled to room temperature and slowly poured into an ice water. The mixture was basified with 10percent sodium hydroxide solution, and the dichloromethane layer was separated. The aqueous layer was re-extracted with dichloromethane (2 x 100 mL) . The combined dichloromethane layers were washed with brine, and dried over sodium sulfate. The dichloromethane was evaporated, and the residue was purified by silica gel (100-200 mesh) column chromatography 5 with 8-12percent. ethyl acetate in hexane as a mobile phase to give the title compound as an off-white solid (28 g, 49.8percent). MS(ESI)m/z: 208 [M (79Br)+l] ,210 [M (81Br)+l]; XH NMR (400 MHz, DMSO-d5) : δ 7.17 (t, J= 7.8 Hz, 1H) ; 7.91 (d, J= 6.0 Hz, 1H) ; 8.02 (d, J = 8.4 Hz, 1H) ; 8.05 (d, J = 8.8 Hz, 1H) ; 8.65 10 (d, J = 5.2 Hz, 1H) 9.48 (s, IH) .
Reference: [1] Patent: WO2016/21742, 2016, A1, . Location in patent: Paragraph 0222; 0223
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Reference: [1] Patent: US2002/6923, 2002, A1,
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Reference: [1] Tetrahedron, 2002, vol. 58, # 29, p. 5761 - 5766
  • 12
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YieldReaction ConditionsOperation in experiment
100% With toluene-4-sulfonic acid In benzene for 4 h; Heating / reflux To a solution of 2-bromobenzaldehyde (5.30 mmol) in benzene (40 mL) was added ethylene glycol (1.26 mL, 22.6 mmol, 4.3 eq) and p-toluenesulfonic acid (70 mg, 0.37 mmol, 0.07 eq). The resulting mixture was heated at reflux in a Dean-Stark apparatus. After 4 h, the reaction was cooled to ambient temperature, quenched with triethylamine, and concentrated in vacuo. Purification was accomplished with chromatography on silica gel. Quantitative yield.
95% With p-toluenesulfonic acid monohydrate In toluene (181-1)
2-Bromobenzaldehyde (11.4 g) was dissolved in toluene (150 mL), and thereto were added ethyleneglycol (4.58 g) and p-toluenesulfonic acid monohydrate (135 mg), and the mixture was refluxed for 6 hours with azeotropic distillation.
The reaction solution was washed with an aqueous sodium hydrogen carbonate solution, and the solvent was evaporated under reduced pressure to give 2-(2-bromophenyl)-1,3-dioxolane (13.4 g, 95percent).
1H NMR (CDCl3, 400 MHz) δ 7.60 (dd, 1H, J=7.6, 1.8 Hz), 7.57 (dd, 1H, J=7.6, 1.8 Hz), 7.34 (ddd, 1H, J=7.6, 7.6, 1.8 Hz), 7.22 (ddd, 1H, J=7.6, 7.6, 1.8 Hz), 6.10 (s, 1H), 4.15 (m, 2H), 4.09 (m, 2H).
95% With p-toluenesulfonic acid monohydrate In toluene (181-1)
2-Bromobenzaldehyde (11.4 g) was dissolved in toluene (150 mL), and thereto were added ethyleneglycol (4.58 g) and p-toluenesulfonic acid monohydrate (135 mg), and the mixture was refluxed for 6 hours with azeotropic distillation.
The reaction solution was washed with an aqueous sodium hydrogen carbonate solution, and the solvent was evaporated under reduced pressure to give 2-(2-bromophenyl)-1,3-dioxolane (13.4 g, 95 percent).
1H NMR (CDCl3, 400MHz) δ 7.60 (dd, 1H, J=7.6, 1.8Hz), 7.57 (dd, 1H, J=7.6, 1.8Hz), 7.34 (ddd, 1H, J=7.6, 7.6, 1.8Hz), 7.22 (ddd, 1H, J=7.6, 7.6, 1.8Hz), 6.10 (s, 1H), 4.15 (m, 2H), 4.09 (m, 2H).
89% With toluene-4-sulfonic acid In toluene for 48 h; Reflux This was a modified procedure according to literature. [8] and [8a] To a round bottom flask, the2-bromobenzaldehyde (3.70 g, 20 mmol), ethylene glycol (1.73 mL, 25 mmol), p-toluenesulfonic acid (60.2 mg, 0.35 mmol) and toluene (30 mL) were added, and the mixture was heated at reflux with a Dean Stark Trap for 24 h. The reaction was monitored by TCL. After the completion of the reaction, the mixture was cooled to room temperature, and the KOH-EtOH solution was added until white solid appeared. Then the organic phase was washed with water and brine, dried over anhydrous K2CO3, and concentrated under vacuum. The crude product was purified by silica gel column chromatography using petroleum ether-EtOAc 100:1 (v/v) as eluent. The product was obtained as yellow oil (4.08 g, 89percent yield).
82% Reflux Toluene (1 L), 2-bromobenzaldehyde (190 g, 1.05 mole) and ethylene glycol (76 ml, 1.3 mole) were heated to reflux with azeotropical distillation of water (-‘10 h). 600 ml of toluene was distilled off and the residual solution was cooled to RT and washed with sat. NaHCO3 solution (200 ml), water (200 ml), dried over Na2SO4, and evaporated under reduced pressure. The crude compound was distilled under high vacuum. 190 g (82percent) of 2-(2-bromophenyl)-1,3-dioxolane as a colorless liquid was received, purity by GC: 98percent.
82% With toluene-4-sulfonic acid In benzene for 24 h; Reflux; Dean-Stark In a 100 mL two-necked flask, 4.97 g (26.9 mmol) of 2-bromobenzaldehyde, 3.49 g (56.2 mmol) of ethylene glycol and 470 mg (2.47 mmol) of p-toluenesulfonic acid monohydrate were added, 10 mL of benzene was added, and the resulting mixture was refluxed with a Dean-Stark apparatus for 24 hours. After cooling to room temperature, the reaction was terminated with saturated aqueous sodium hydrogen carbonate solution, and extracted with dichloromethane. The organic layer was dried with sodium sulfate, and the solvent was distilled off under reduced pressure to obtain a crude product. The crude product was purified by silica gel column chromatography (dichloromethane) to obtain 5.01 g (22.1 mmol) of 2- (2-bromophenyl)-1,3-dioxolane in a yield of 82percent. The measurement results of NMR are shown below.
77% With toluene-4-sulfonic acid In toluene at 118 - 120℃; for 2 h; Dean-Stark; Microwave irradiation A solution of 2-bromobenzaldehyde (12a, 37.1 g, 0.20 mol), ethylene glycol (50 mL, 55.6 g, 0.90 mol) and p-toluenesulfonic acid (1.0 g, 0.005 mol) in toluene (200 mL) was refluxed in a Dean-Stark apparatus (bp 118-120 °C) in a microwave reactor under irradiation with a constant 650 W energy for 2 h.29 The reaction mixture was washed with aqueous sodium hydrogen carbonate solution (5 w/wpercent, 200 mL) and water (200 mL), dried over MgSO4 and the solvent was evaporated. The crude pale yellow oil was distilled under reduced pressure (0.04 mbar) at 86-88 °C to give 13a (35.15 g, 77percent) as a colorless oil. 1H NMR (DMSO-d6, 500 MHz) δ 7.63 (1H, dd, J=8.1, 1.2 Hz), 7.58 (1H, dd, J=7.3, 1.8 Hz), 7.43 (1H, td, J=8.1, 1.2 Hz), 7.34 (1H, td, J=7.3, 1.8 Hz), 5.95 (1H, s), 4.08 (2H, m), 3.98 (2H, m). 13C NMR (DMSO-d6, 100 MHz) δ 136.7, 132.9, 131.2, 128.3, 127.8, 122.3, 101.9, 65.1. IR (KBr, cm-1) 2889, 1472, 1352. Anal. Calcd for C9H9BrO2 (229.07): C 47.19, H 3.96, Br 34.88percent. Found: C 46.69, H 4.07, Br 34.83percent.

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YieldReaction ConditionsOperation in experiment
94% With toluene-4-sulfonic acid In ethylene glycol; toluene Example 4
Synthesis of N-methyl-2-{2-(1,3-dioxolan-2-yl)phenyl}-2-methoxyiminoacetamide (III)
A mixture of 50.0 g (0.270 mol) of 2-bromobenzaldehyde, 33.5 g (0.54 mol) of ethylene glycol, 0.51 g (2.7 mmol) of p-toluenesulfonic acid and 300 ml of toluene was heated under reflux for 2 hours while removing water.
The reaction mixture was cooled and 300 ml of toluene was added.
The mixture was washed with saturated sodium bicarbonate aqueous solution, water and saturated brine in that order and then dried over anhydrous sodium sulfate.
After evaporation of the solvent, the residue was distilled under a reduced pressure to give 66.0 g of 2-(2-bromophenyl)-1,3-dioxolan.
The yield was 94percent.
Boiling point; 104 - 108°C/1.5 mm
1H-NMR δ (CDCl3); 4.05 - 4.2 (4H, m), 6.11 (1H, s), 7.2 - 7.6 (4H, m)
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YieldReaction ConditionsOperation in experiment
88.9% With toluene-4-sulfonic acid In ethylene glycol; toluene C.
2-(2-Bromophenyl)-1,3-dioxolane
A 12 L 3-necked flask fitted with an overhead stirrer was charged with 2-bromobenzaldehyde (800 g, 4.324 moles), ethylene glycol (402.6 g, 6.485 moles), p-toluenesulfonic acid. H2 O (3.95 g, 0.021 moles) and toluene (3.785 kg, 41.074 moles).
One side of the flask was stoppered (glass) and a Dean-Stark separator/condenser/N2 port was attached to the other side.
The heterogeneous yellow reaction mixture was stirred under a nitrogen atmosphere and heated to reflux for about 45 minutes.
Water was collected via the Dean-Stark separator and the residue was cooled to room temperature and washed with 1.2 L of saturated aqueous NaHCO3 followed by 1.2 L of saturated aqueous NaCl.
The combined organic layers were dried over anhydrous MgSO4, filtered, concentrated on a rotary evaporator and dried under high vacuum to provide title compound in the form of an oil.
The so-formed oil was vacuum distilled to provide 52 g and 876.2 g of title compound (88.9percent yield).
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YieldReaction ConditionsOperation in experiment
78% at 0 - 25℃; Inert atmosphere General procedure: To a solution of triphenylphosphoranylidene (1.5 mmol) in 10 ml of solvent (CH2Cl2 or THF) was added dropwise a solution of the aldehyde (1.0 mmol) in 4 ml of solvent (CH2Cl2 or THF) at 0 °C under an inert argon atmosphere. The resulting mixture was stirred at 25 °C until completion of the reaction, which was monitored by TLC. The solvent was then evaporated under reduced pressure to give the crude product which was purified by silica gel (60-120 mesh) column chromatography using petroleum ether/ethyl acetate as the eluent to afford the desired product.
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YieldReaction ConditionsOperation in experiment
58% With sodium tetrahydroborate; methylamine In tetrahydrofuran; methanol EXAMPLE
(Compound 22)
Preparation of a:
29.4 g of o-Bromobenzaldehyde and 81 ml of aqueous, 40percent methylamine solution are combined with 238 ml of THF and at RT 19 g of NaBH4 are added in batches within 25 minutes.
The mixture is left to stand overnight at RT, concentrated using a rotary evaporator, and the residue is stirred into ice water.
The aqueous phase is extracted twice with ether and the combined ether phases are evaporated down under reduced pressure.
After chromatography on silica gel with ethyl acetate or ethyl acetate/methanol (4:1) as eluant, 18.5 g of N-methyl-2-bromobenzylamine (a) are obtained in the form of a yellowish liquid. Yield: 58percent.
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YieldReaction ConditionsOperation in experiment
59% With copper(II) acetate monohydrate; sodium carbonate In toluene at 100℃; for 24 h; General procedure: A mixture ofaldehyde 1 (6.8 mmol), amidine hydrochloride 2 (2 g,11.4 mmol), Na2CO3 (1.21 g, 11.4 mmol, 1.0 equiv) andCu(OAc)2 (10 molpercent) was stirred in toluene (20 mL) under100 °C in air for 24 h. After completion of the reaction, themixture was cooled to room temperature. The water wasadded to the reaction system and atmospheric distillation untiltoluene was evaporated. The resulting solution was filteredand residue with hot water washed 3 times. The crude productwas purified by column chromatography on silica gel usingpetroleum ether/EtOAc (100:1) as an eluent to give the correspondingproducts 7a-7x.
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  • 69
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YieldReaction ConditionsOperation in experiment
94% at 0℃; for 4.66667 h; To a solution of 2-bromobenzaldehyde (10.0 g, 53.7 mmol) in H2SO4 (100 mL) was added K O3 (5.43 g, 53.7 mmol) in portions over 1 h at 0°C. The mixture was stirred for 40 min and additional K O3 (0.72 g) was added. The reaction mixture was stirred at 0°C for 3 h then poured into ice water. The resulting precipitate was collected by filtration, rinsed with water and recrystallized from EtOAc/Pentane to give 2-bromo-5-nitrobenzaldehyde (11.7 g, 94percent yield) as a white solid. MS (ESI) calcd for C7H4BrN03: 228.9
94% at 0℃; for 3.67 h; To a solution of 2-bromobenzaldehyde (10.0 g, 53.7 mmol) in H2SO4 (100 mL) was added KNO3 (5.43 g, 53.7 mmol) in portions over 1 h at 0° C. The mixture was stirred for 40 min and additional KNO3 (0.72 g) was added. The reaction mixture was stirred at 0° C. for 3 h then poured into ice water. The resulting precipitate was collected by filtration, rinsed with water and recrystallized from EtOAc/Pentane to give 2-bromo-5-nitrobenzaldehyde (11.7 g, 94percent yield) as a white solid. MS (ESI) calcd for C7H4BrNO3: 228.9.
83% at 0℃; for 3 h; KNO3 (1.09 g, 10.8 mmol) was added slowly to a stirred red solution of 2-bromobenzaldehyde (2.0 g, 10.8 mmol) in H2SO4 (10 mL) at 0 °C. After 30 minutes extra portion of KNO3 (0.16 g, 1.6 mmol) was added, and the reaction mixture was stirred for 2.5 hours at 0 °C. Then the reaction mixture was poured over ice water (50 mL), extracted with Et2O (3×25 mL). Combined organic layers were washed with water (30 mL), brine (40 mL) and dried over Na2SO4. Solvents were evaporated in vacuo. The residual yellow solid was recrystallized from EtOAc/hexane (1/2, 40 mL) to give pure nitroaldehyde SI-1e (1.32 g, 5.7 mmol, 53percent). Further recrystallization of evaporated mother liquor from EtOAc/hexane (1/3, 15 mL) gives additional nitroaldehyde SI-1e (0.75 g, 3.2 mmol, 30percent) of the same purity.
55% at 5 - 20℃; for 1.5 h; A mixture of concentrated sulfuric acid (17.01 mL) andfuming nitric acid (2.250 mL) was cooled to 5 °C followedby the dropwise addition of 2—bromobenzaldehyde (3.15 mL,27.0 mmol) over a period of 30 minutes. The mixture wasthen allowed to warm to room temperature and stirred for60 minutes. The reaction mixture was poured intoice/water (200 mL) and the precipitated solid isolated by filtration, washed with water and sucked dry to give a pale yellow solid. This was recrystallised from 50:50 cyclohexane:ethyl acetate (30 mL) to give the title compound as an off—white solid (3.39 g, 55percent) . ‘H NMR(300 MHz, CDC13) : 3 10.39 (s, 1H) , 8.72 (d, 1H) , 8.29 (dd,1H) , 7.89 (d, 1H)
54.6% at 0℃; for 4.66667 h; Intermediate 17: l-(2-bromo-5-nitrophenyl)-N-methylmethanamine; Intermediate 17A:; [00237] Potassium nitrate (2.59 mL, 54.0 mmol) was added portionwise to a stirred and chilled (ice bath) solution of 2-bromobenzaldehyde (10 g, 54.0 mmol) in sulfuric acid (50 mL, 938 mmol) over 1 h. After 40 min an additional portion of KNO3 (0.72 g) was added. After 3 h stirring at 0 0C, the mixture was poured over ice water, and the product was filtered and washed with water. The crude pale yellow solid was recrystallized from 1 : 1 ethyl acetate/hexane (-60 mL) to give Intermediate 17A (6.789 g, 29.5 mmol, 54.6 percent yield). MS (ESI) m/z 230, 232 (M+H)+.

Reference: [1] Patent: WO2014/186313, 2014, A1, . Location in patent: Page/Page column 173-174
[2] Patent: US2015/152108, 2015, A1, . Location in patent: Paragraph 0881; 0882
[3] Tetrahedron Letters, 2016, vol. 57, # 1, p. 11 - 14
[4] Organic and Biomolecular Chemistry, 2017, vol. 15, # 6, p. 1355 - 1362
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[6] Patent: WO2015/92431, 2015, A1, . Location in patent: Page/Page column 303
[7] Patent: WO2008/79836, 2008, A2, . Location in patent: Page/Page column 106
[8] European Journal of Organic Chemistry, 2011, # 28, p. 5626 - 5635
[9] Molecules, 2000, vol. 5, # 3, p. 227 - 239
[10] Patent: US5062884, 1991, A,
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YieldReaction ConditionsOperation in experiment
89% at 50℃; for 3 h; To a solution of 2-bromobenzaldehyde (1.85 g, 10 mmol) and 4- methoxyphenyl acetylene (1.58 g, 12 mmol) in 40 mL of triethylamine were added dichlorobis(triphenylphosphine) palladium(ll) (140 mg, 2 molpercent) and copper(l) iodide (20 mg, 1 molpercent). The reaction mixture was heated at 5O0C under nitrogen for 3 hours. The reaction mixture was cooled to room temperature and the ammonium salt was removed by filtration. The filtrate was concentrated under reduced pressure. Purification of the crude compound by column chromatography (SilicaGel 230-400 mesh; 10percent ethyl acetate in hexanes as eluent) afforded of 2- (4-methoxy phenylethynyl) benzaldehyde (2.1 g, 89percent).
89% at 50℃; for 3 h; To a solution of 2-bromobenzaldehyde (1.85 g, 10 mmol) and 4-methoxyphenyl acetylene (1.58 g, 12 mmol) in 40 mL of triethylamine were added dichlorobis(triphenylphosphine)palladium(II) (140 mg, 2 mol percent) and copper (I) iodide (20 mg, 1 mol percent). The reaction mixture was heated at 50° C. under nitrogen for 3 h. The reaction mixture was cooled to room temperature and the ammonium salt was removed by filtration. The filtrate was concentrated under reduced pressure. Purification of the crude compound by column chromatography (silica gel 230-400 mesh; 10percent ethyl acetate in hexanes as eluent) afforded 2-(4-methoxyphenylethynyl)benzaldehyde (2.1 g, 89percent). The above compound (2.06 g, 8.73 mmol) and t-butylamine (3.83 g, 52.4 mmol) were stirred under nitrogen for 24 h at room temperature. The resulting mixture was extracted with ether and the organic layer was dried over anhydrous Na2SO4, and concentrated to give the imine (2.4 g, 94percent), which was used in the next step without further purification. To a solution of the above imine (2.39 g, 8.2 mmol) in 100 mL anhydrous DMF was added (0.156 g, 0.82 mmol) copper (I) iodide, and the solution was flushed with nitrogen. The reaction mixture was heated at 100° C. for 4 h. The mixture was cooled to room temperature, and diluted with ether (200 mL). The organic layer was washed with saturated aqueous ammonium chloride (3.x.100 mL). The organic layer was dried over anhydrous Na2SO4 and concentrated to give the crude compound as a dark colored solid. Purification by column chromatography (silica gel 230-400 mesh; 10percent ethylacetate in hexanes as eluent) afforded 3-(4-methoxyphenyl)isoquinoline (1.064 g, 55percent), as a white solid. The 3-(4-methoxyphenyl)isoquinoline (1.05 g, 4.47 mmol) was suspended in 30 mL hydroiodic acid and 12 mL of acetic acid was added. The reaction mixture was stirred at 110° C. for 2 h, then cooled to room temperature. The precipitate formed was filtered off, washed with acetic acid (2.x.5 mL) and dried under vacuum, to give a yellow solid. The crude compound was purified by triturating with 5percent methanol in ether to give 4-isoquinolin-3-yl-phenol (0.83 g, 84percent) as a white powder. Selected data: MS (ES) m/z: 222.89, 221.86; MP 218-219° C.
84% With potassium carbonate In N,N-dimethyl-formamide at 100℃; for 13 h; Green chemistry General procedure: A mixture of aryl halide (1mmol), terminal alkyne (1mmol), K2CO3 (2mmol) and MNPFemTriazNHCAg complex (6) (100mg) in DMF (5mL) was stirred at 100°C. The progress of reaction was monitored by TLC. After completion, the reaction mixture was quenched in ice cold water and 6 was separated by external magnet. The reaction mixture was extracted with ethyl acetate (3×25mL). Evaporation of solvent in vaccuo followed by column chromatography over silica gel using petroleum ether/ethyl acetate afforded desired Sonogashira coupling products.
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