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Chemical Structure| 13781-53-8 Chemical Structure| 13781-53-8

Structure of 13781-53-8

Chemical Structure| 13781-53-8

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Product Details of [ 13781-53-8 ]

CAS No. :13781-53-8
Formula : C6H5NS
M.W : 123.18
SMILES Code : N#CCC1=CSC=C1
MDL No. :MFCD00005471
InChI Key :GWZCLMWEJWPFFA-UHFFFAOYSA-N
Pubchem ID :83730

Safety of [ 13781-53-8 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302+H312+H332-H315-H319-H335
Precautionary Statements:P261-P280-P305+P351+P338

Computational Chemistry of [ 13781-53-8 ] Show Less

Physicochemical Properties

Num. heavy atoms 8
Num. arom. heavy atoms 5
Fraction Csp3 0.17
Num. rotatable bonds 1
Num. H-bond acceptors 1.0
Num. H-bond donors 0.0
Molar Refractivity 33.84
TPSA ?

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

52.03 Ų

Lipophilicity

Log Po/w (iLOGP)?

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

1.49
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

1.26
Log Po/w (WLOGP)?

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

1.81
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.

0.75
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

2.8
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

1.62

Water Solubility

Log S (ESOL):?

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

-1.79
Solubility 1.98 mg/ml ; 0.0161 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.

-1.95
Solubility 1.38 mg/ml ; 0.0112 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

-2.11
Solubility 0.952 mg/ml ; 0.00773 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

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.

-6.16 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

0.0 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)

1.96

Application In Synthesis of [ 13781-53-8 ]

* 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 [ 13781-53-8 ]

[ 13781-53-8 ] Synthesis Path-Downstream   1~35

  • 1
  • [ 13781-53-8 ]
  • [ 59311-67-0 ]
YieldReaction ConditionsOperation in experiment
67% With indium(III) chloride; sodium tetrahydroborate; In tetrahydrofuran; at 25℃; for 16h;Inert atmosphere; This compound was synthesized according to a procedure described in literature.5 An oven-dried round-bottom flask (25 mL) cooled under argon was fitted with a rubber septum and charged with a stir bar, anhydrous InCl3 (0.681 g, 3.079 mmol), anhydrous THF (10 mL), and NaBH4 (0.341 g, 9.014 mmol). The reaction was stirred at 25 C for 1h, followed by the dropwise addition of 3-thiopheneacetonitrile (0.340 mL, 2.981 mmol), and the mixture was stirred at 25 C for 16 h. The solution was quenched with 10 mL of 2.8 M hydrochloric acid, and the solution was refluxed for 2 h to dissolve remaining metal salts. The reaction mixture was cooled to 25C, 5 mL of methanol were added, and the mixture was again refluxed for 2 h. The reaction mixture was then cooled to 25C and filtered, and the methyl borate/methanol was removed from the filtrate by evaporation. The remaining acidic solution was extracted with DCM (3 10 mL), and the organic layers were discarded. The acidic aqueous layer was then basified with NaOH pellets to pH ≈ 11 and again extracted with DCM (3 10 mL). The combined organic layers were dried on a WA filter filtered, and evaporated under vacuum to afford 2-(3-thienyl)ethanamine 7. Yellowish oil; 0.250 g, yield: 67%. 1H NMR (300 MHz, CDCl3): δ = 7.20-7.30 (m, 1H; ArH), 7.00 (m, 1H; ArH), 6.95 (m, 1H; ArH), 2.96 (t, 2H; J = 6.6 Hz, CH2), 2.78 (t, 2H; J = 6.6 Hz, CH2), 1.45 ppm (bs, 2H; NH2). The 1H NMR spectrum was according to literature.
With hydrogenchloride;aluminium chloride; In diethyl ether; water; (a) Thiophene-3-ethylamine A solution of anhydrous aluminium chloride (26.6 g) in diethylether (100 ml) was added to a stirred suspension of lithium aluminium hydride (7.6 g) in ether (100 ml) under nitrogen atmosphere at room temperature. To the stirred mixture was added thiophene-3-acetonitrile (24.6 g) in ether dropwise over 30 minutes, the exothermic reaction causing the mixture to reflux. After 1 hour water (8 ml) was added cautiously (exothermic) followed by 5M aqueous HCl (400 ml). The aqueous layer was separated and basified to pH~11 with 50% aqueous NaOH (160 ml). The aqueous solution was extracted with dichloromethane (2*200 ml) and the extracts dried over magnesium sulphate, filtered and evaporated to a pale yellow liquid. Distillation gave thiophene-3-ethylamine as a colourless liquid, b.p. 78-79 at 6 mmHg.
With hydrogenchloride;aluminium chloride; In diethyl ether; water; (a) Thiophene-3-ethylamine A solution of anhydrous aluminium chloride (26.6 g) in diethylether (100 ml) was added to a stirred suspension of lithium aluminium hydride (7.6 g) in ether (100 ml) under nitrogen atmosphere at room temperature. To the stirred mixture was added thiophene-3-acetonitrile (24.6 g) in ether dropwise over 30 minutes, the exothermic reaction causing the mixture to reflux. After 1 hour water (8 ml) was added cautiously (exothermic) followed by 5M aqueous hydrochloric acid (400 ml). The aqueous layer was separate and basified to pH ~11 with 50% aqueous sodium hydroxide (160 ml). The aqueous solution was extracted with dichloromethane (2*200 ml) and the extracts dried over magnesium sulphate, filtered and evaporated to a pale yellow liquid (25.0 g). Distillation gave thiophene-3-ethylamine as a colourless liquid, b.p. 78-79 at 6 mmHg.
Thiophen-3-yl-acetonitrile (5.0 g, 40.6 mmol) was dissolved in 50 mL THF. BH3-THF (61 mL, 1M in THF) was added slowly. The reaction was heated to 60 C. overnight then quenched carefully with 4% aqueous HCl until no effervescence was observed. The crude reaction mixture was then partitioned between EtOAc and water (300 mL each). The aqueous layer was acidified with 30% NaOH to pH 12 and the product was extracted into DCM/EtOH (4:1, 3×). The organic extracts were dried over MgSO4 and concentrated to give 2.9 g of the subtitle compound as an oil.
With dimethylsulfide borane complex; In tetrahydrofuran; at 70℃; for 15h; To a solution of 2-<strong>[13781-53-8](thiophen-3-yl)acetonitrile</strong> (3.02 g, 24.3 mmol) in THF (48 mL), borane-methyl sulfide complex (3.5 mL, 35.4 mmol)was added dropwise and then stirred for 15 h at 70.After completion, the mixture was cooled to room temperature, and diluted with MeOH. HCl solutionin MeOH was added and stirred at room temperature. The mixture was concentrated in vacuum andwashed with Et2O to yield 5a.MS: 128.1[M+H]+.

  • 3
  • [ 13781-53-8 ]
  • [ 110-62-3 ]
  • [ 73812-05-2 ]
  • 4
  • [ 13781-53-8 ]
  • [ 36321-73-0 ]
  • [ 144061-74-5 ]
  • 5
  • [ 13781-53-8 ]
  • [ 108-94-1 ]
  • [ 75606-26-7 ]
  • 7
  • [ 13781-53-8 ]
  • [ 107-87-9 ]
  • [ 73811-91-3 ]
  • 8
  • [ 13781-53-8 ]
  • [ 529-20-4 ]
  • 3-(3'-Thienyl)-2-(2''-tolyl)propenenitrile [ No CAS ]
  • 9
  • [ 13781-53-8 ]
  • [ 96-22-0 ]
  • [ 73811-92-4 ]
  • 10
  • [ 13781-53-8 ]
  • [ 78-93-3 ]
  • [ 73811-90-2 ]
  • 12
  • [ 13781-53-8 ]
  • 5-(thiophen-3-ylmethyl)-1H-1,2,3,4-tetrazole [ No CAS ]
  • 13
  • [ 13781-53-8 ]
  • [ 118-74-1 ]
  • α-(3-Thiophene-yl)-α-(2,3,4,5,6-pentachlorophenyl)acetonitrile [ No CAS ]
  • 14
  • [ 13781-53-8 ]
  • [ 95-94-3 ]
  • trans-1,2-Dicyano-1,2-di-(3-thienyl)ethylene [ No CAS ]
  • α-(3-Thiophene-yl)-α-(2,3,5,6-tetrachlorophenyl)acetonitrile [ No CAS ]
  • 15
  • [ 13781-53-8 ]
  • [ 67-56-1 ]
  • 2-Thiophen-3-yl-acetimidic acid methyl ester; hydrochloride [ No CAS ]
  • 16
  • [ 13781-53-8 ]
  • [ 1732-26-9 ]
  • 5-(3-thienylmethyl)-4-pyrenecarbonitrile [ No CAS ]
  • 17
  • [ 13781-53-8 ]
  • [ 185040-39-5 ]
  • [ 185040-40-8 ]
YieldReaction ConditionsOperation in experiment
340 mg (78%) With NaH; In methanol; 2-ethoxy-ethanol; dichloromethane; mineral oil; EXAMPLE 101 (8-Ethyl-7-imino-6-thiophen-3-yl-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-yl)-phenylamine To a suspension of NaH (60% in mineral oil, 27 mg) in 5 mL of 2-ethoxyethanol was added 3-thiopheneacetonitrile (168 mg, 1.36 mmol). After stirring for 5 minutes at room temperature, 4-ethylamino-2-phenylamino-pyrimidine-5-carbaldehyde (300 mg, 1.24 mmol) was added, and the reaction heated at 120 C. for 2 hours, resulting in a dark brown solution. Upon cooling, the solution was poured into water which caused precipitation. The resulting precipitate was removed by filtration and washed with water. The crude product was purified by flash chromatography, eluding with 5% methanol/methylene chloride, followed by 10% methanol/methylene chloride. Concentration of product fractions yielded 340 mg (78%) of (8-ethyl-7-imino-6-thiophen-3-yl-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-yl)-phenylamine; mp 220-222 C. Mass spectrum (CI) 348 (M+).
  • 18
  • [ 13781-53-8 ]
  • [ 185040-32-8 ]
  • [ 214983-01-4 ]
  • 19
  • [ 13781-53-8 ]
  • [ 699-98-9 ]
  • (5-oxo-5<i>H</i>-furo[3,4-<i>b</i>]pyridin-7-ylidene)-thiophen-3-yl-acetonitrile [ No CAS ]
  • 20
  • [ 13781-53-8 ]
  • [ 6940-76-7 ]
  • 5-chloro-2-thiophen-3-yl-pentanenitrile [ No CAS ]
  • 21
  • [ 13781-53-8 ]
  • [ 17849-38-6 ]
  • 9-aminonaphtho[2,3-b]thiophen-8-ylmethanol [ No CAS ]
  • 22
  • [ 13781-53-8 ]
  • (E)-1-Bromo-2-butene [ No CAS ]
  • 3-methyl-1-thiophen-3-yl-pent-4-en-2-one [ No CAS ]
  • 23
  • [ 13781-53-8 ]
  • [ 17649-86-4 ]
  • (E)-3-Methylsulfanyl-5-oxo-2-thiophen-3-yl-hex-3-enenitrile [ No CAS ]
  • 24
  • [ 13781-53-8 ]
  • [ 185245-65-2 ]
  • 7-phenyl-5-piperidinobenzo[b]thiophene-4-carbonitrile [ No CAS ]
  • 25
  • [ 13781-53-8 ]
  • [ 147726-34-9 ]
  • 5-methoxy-7-phenylbenzo[b]thiophene-4-carbonitrile [ No CAS ]
  • 26
  • [ 13781-53-8 ]
  • [ 106-95-6 ]
  • [ 205745-04-6 ]
  • 27
  • [ 13781-53-8 ]
  • (Z)-4-Methylsulfanyl-4-morpholin-4-yl-but-3-en-2-one [ No CAS ]
  • 7-methyl-5-morpholinobenzo[b]thiophene-4-carbonitrile [ No CAS ]
  • 28
  • [ 13781-53-8 ]
  • [ 109-94-4 ]
  • 3-hydroxy-2-(thien-3-yl)acrylonitrile sodium salt [ No CAS ]
  • 29
  • [ 13781-53-8 ]
  • [ 33513-42-7 ]
  • (Z)-3-Dimethylamino-2-thiophen-3-yl-acrylonitrile [ No CAS ]
  • 30
  • [ 13781-53-8 ]
  • [ 75-03-6 ]
  • [ 849518-85-0 ]
YieldReaction ConditionsOperation in experiment
18% With lithium hexamethyldisilazane; In tetrahydrofuran; for 0.833333h;Inert atmosphere; Step 1 : 2-(thiophen-3-yl)butanenitrileA cooled solution of 2-(3-thienyl)acetonitrile (3.144 g, 25.52 mmol) in TΗF (30 mL) under nitrogen was treated with LΗMDS in TΗF (22.70 g, 25.51 mL of 1 M, 25.50 mmol) dropwise over a period of 20 minutes. The mixture was allowed to stir for 30 minutes and then treated with iodoethane (4.180 g, 2.144 mL, 26.80 mmol) dropwise. The reaction was stirred at RT for a further hour and then quenched by the addition of MeOH and concentrated in vacuo. The residue was diluted with water and extracted with EtOAc (2x). The combined organics were dried (MgSO4), filtered, concentrated and purified by column chromatography (6: 1 Petroleum ether/EtOAc) to give the product as an oil (708mg, 18% Yield). 1H NMR (CDCB, 400 MHz) δ 1.08 (3H, t), 1.93- 2.00 (2H, q), 3.86 (IH, m), 7.03 (IH, m), 7.25 (IH, m), 7.37 (IH, m)
  • 31
  • [ 13781-53-8 ]
  • [ 64-17-5 ]
  • ethyl 2-(thiophen-3-yl)acetimidate hydrochloride [ No CAS ]
  • 32
  • [ 13781-53-8 ]
  • [ 34843-84-0 ]
YieldReaction ConditionsOperation in experiment
94% Thiophen-3-yl-acetonitrile (2.0 g, 16.2 mmol)Soluble in tetrahydrofuran (36mL),The borane-dimethyl sulfide complex (3.0 mL, 30.4 mmol) was slowly added, and the reaction mixture was heated to reflux for 16 hours. At room temperature, the reaction was quenched by the slow addition of methanol.Then add saturated hydrogen chloride / methanol solution (10mL),Stir at room temperature for 20 minutes, concentrate to give a solid initial product.Wash with diethyl ether (20 mL).The compound 41A was obtained as a white solid (2.5 g, yield: 94%).
94% Preparation 1; 2-Thiophene-3-yl-ethylamine hydrochloride; Slowly add borane methyl sulfide complex (30.4 mL, 304.4 mmol) to a solution of thiophen-3-yl-acetonitrile (25.0 g, 203.0 mmol) in tetrahydrofuran (450 mL). Heat the reaction at reflux for 16 h and then cool to RT. Slowly quench the reaction with methanol (50 mL) until no foaming is observed. To this mixture slowly add methanol (100 mL) which is saturated with hydrogen chloride. Stir the mixture at RT for 20 min before concentrating in vacuo. Add methanol (100 mL) to the mixture and concentrate in vacuo. Suspend the resulting solid in diethyl ether (200 mL) and filter to afford 31.1 g (94%) of the crude title compound. MS/ES m/z 128.3 [M+H]+.
94% Step 1. 2-Thiophene-3-yl-ethylamine hydrochloride; Slowly add borane methyl sulfide complex (30.4 mL, 304.4 mmol) to a solution of thiophen-3-yl-acetonitrile (25.0 g, 203.0 mmol) in tetrahydrofuran (450 mL). Heat the reaction at reflux for 16 h and then cool to RT. Slowly quench the reaction with methanol (50 mL) until no foaming is observed. To this mixture slowly add methanol (100 mL) which is saturated with hydrogen chloride. Stir the mixture at RT for 20 min before concentrating in vacuo. Add methanol (100 mL) to the mixture and concentrate in vacuo. Suspend the resulting solid in diethyl ether (200 mL) and filter to afford 31.1 g (94%) of the crude title compound. MS/ES m/z 128.3 [M+H]+
2-Thiophen-3-yl-ethylamine hydrochloride.A soln. of 3-thiopheneacetonitrile (18.44 g, 0.15 mol) in THF (245 mL) was added dropwise to a RT soln. of 1 M borane.THF complex (300 mL, 0.3 mol) under argon and the resulting mixture was heated to reflux for 3h followed by stirring at RT overnight. The reaction mixture was cautiously quenched with MeOH and subsequently concentrated in vacuo. The residue was dissolved in MeOH (150 mL) and 4M HCI in dioxane (105 mL, 2.8 eq.) was added cautiously under vigorous stirring and the mixture was stirred for 30 min. The soln. was evaporated in vacuo and the residue was re-dissolved in MeOH and re-evaporated. This dissolution and evaporation procedure was repeated a further two times to give the crude product as its HCI salt that was suspended in 3:7 'PrOH:EtOAc and stirred for 15 min. The suspension was filtered and the residue was dried in vacuo to give the title compound as a white solid (20.73 g). LC-MS A: tR = 0.33 min; [M+H+MeCN]+ = 169.06.

  • 33
  • [ 13781-53-8 ]
  • [ 4815-30-9 ]
  • [ 917087-61-7 ]
YieldReaction ConditionsOperation in experiment
Production Example 1 Ethyl 5-methyl-4-oxo-2-(thiophen-3-ylmethyl)-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylate 515 Milligrams of diethyl 5-amino-3-methylthiophene-2,4-dicarboxylate and 296 mg of 3-thiopheneacetonitrile were added to 8 mL of 4N hydrogen chloride-dioxane solution and stirred for 10 hours. Thereafter the liquid reaction mixture was poured on ice, and its pH was adjusted to 8 - 9 with 25% aqueous ammonia. Whereupon precipitated crystals were recovered by filtration and washed first with water, and then with hexane. The crude crystals were recrystallized from a liquid mixture of N,N-dimethylformamide and cyclohexane, to provide 397 mg of the title compound. 1H-NMR(DMSO-d6) δ: 1.30(3H,t,J=7, 1Hz),2.81(3H,s), 3.97(2H,s),4.30(2H,q,J=7.1Hz),7.0-7.6(3H,m),12.74(1H,br s) MS(m/z):334(M+)
With hydrogenchloride; In 1,4-dioxane; cyclohexane; N,N-dimethyl-formamide; 1-a : Synthesis of ethyl 5-methyl-4-oxo-2-(thiophen-3-ylmethyl)-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylate To 8 mL of 4N hydrogen chloride in dioxane solution, 515 mg of diethyl 5-amino-3-methylthiophene-2,4-dicarboxylate and 296 mg of 3-thiopheneacetonitrile were added, and stirred for 10 hours. Thereafter the liquid reaction mixture was poured on ice, and its pH was adjusted to 8-9 with 25% aqueous ammonia. Whereupon precipitated crystals were recovered by filtration and washed with water and hexane, by the order stated. The crude crystals were recrystallized from a liquid mixture of N,N-dimethylformamide and cyclohexane, to provide 397 mg of the title compound. 1H-NMR(DMSO-d6)δ:1.30(3H,t,J=7.1Hz),2.81(3H,s),3.97(2H,s), 4.30(2H,q,J=7.1Hz),7.0-7.6(3H,m),12.74(1H,br s) MS(m/z):334(M+)
  • 34
  • [ 13781-53-8 ]
  • [ 106-89-8 ]
  • (+/-)-1-(thiophen-3-yl)-3-oxa-bicyclo[3.1.0]hexan-2-one [ No CAS ]
 

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