Structure of 62224-16-2
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CAS No. : | 62224-16-2 |
Formula : | C6H5BrO2S |
M.W : | 221.07 |
SMILES Code : | COC(=O)C1=CC(Br)=CS1 |
MDL No. : | MFCD06203668 |
InChI Key : | HPZXLAIWCQLSAR-UHFFFAOYSA-N |
Pubchem ID : | 12752071 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 10 |
Num. arom. heavy atoms | 5 |
Fraction Csp3 | 0.17 |
Num. rotatable bonds | 2 |
Num. H-bond acceptors | 2.0 |
Num. H-bond donors | 0.0 |
Molar Refractivity | 43.3 |
TPSA ? Topological Polar Surface Area: Calculated from |
54.54 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
2.31 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.48 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
2.3 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
1.69 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
3.04 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.36 |
Log S (ESOL):? ESOL: Topological method implemented from |
-3.01 |
Solubility | 0.216 mg/ml ; 0.000975 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.27 |
Solubility | 0.119 mg/ml ; 0.000537 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.6 |
Solubility | 0.553 mg/ml ; 0.0025 mol/l |
Class? Solubility class: Log S scale |
Soluble |
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) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
Yes |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-5.89 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
0.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
2.37 |
* 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.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With sulfuric acid; at 25 - 50℃; for 12h; | To a solution of 4-bromo-2-thiophenecarboxylic acid (4g, 19 mmol) in MeOH (100 ml.) was added H2SO4 (5 ml.) dropwise at 25 0C. The solution was stirred for 12 h at 50 0C and was poured into ice-H2O and the pH was adjusted to ~1 1 with aqueous NaOH. The aqueous phase was extracted several times with DCM and the combined organic fractions were dried over Na2SO4, concentrated and used directly (4.27g, quant.): LCMS (ES) m/z 222 (M+H)+. |
100% | sulfuric acid; at 50℃; | Example 1; Preparation of Lambda/-{(1 S)-2-amino-1-[(3,4-difluorophenyl)methyl1ethyl}-4-(1 /-/-pyrazol-4-yl)-2- thiophenecarboxamide; a) methyl 4-bromo-2-thiophenecarboxylate; To a solution of 4-bromo-2-thiophenecarboxylic acid (7 g, 34 mmol) in MeOH (170 ml.) was added cone. H2SO4 (17 ml_). After heating to 50 0C for 12 h, the reaction solution was cooled to room temperature and diluted with CHCI3 (100 ml_). The CHCI3 solution was washed with cold aqueous NaHCO3, then 5N NaOH and dried over Na2SO4. Concentration under vacuum gave the title compound as a yellow oil (7.2 g, quant.): LCMS (ES) m/z 222 (M+H)+. |
95% | To a dry flask under N2 with a stirbar was added 6 g (29.1 mmol) of 4- bromothiophene-2-carboxylic acid (as prepared in the previous step) and dry methanol (100 mL). The solution was cooled in an ice-salt bath for 15 min and 2.55 mL (34.9 mmol) of thionyl chloride was added over 15 min, keeping the temperature <-5o C. The reaction mixture was stirred on the ice-salt bath for an additional 15 min, then for 1 h at rt, and finally refluxed for 8 h under N2. The resulting solution was cooled and concentrated to 6.7 g of pale amber oil. This oil was passed through 150 g of silica WITH ~600 mL CH2C12 (discarded the first 120 mL which contained minor impurities and no ester). The solvent was removed in vacuo to afford 6.11 g (95% yield) of the title compound as a colorless solid, which was used in the next step without further purification. |
91.4% | With thionyl chloride; for 6h;Reflux; | In 100ml single neck flask was added 4-bromo-2-thiophenecarboxylic acid 2.07g (10mmol), thionyl chloride 1.19g (10mmol) and absolute ethanol 25ml, refluxed, 6h After TLC showed the starting material is no longer remaining. The solvent was distilled off under reduced pressure, ice water was added, adjusting the pH with saturated sodium carbonate solution to 9 to 10, and extracted with ethyl acetate (40ml × 3), the combined organic phase was washed twice with saturated brine, dried over anhydrous MgSO 4, pale yellow oily liquid 2.02g, yield 91.4%. |
90% | With sulfuric acid; for 10h;Heating / reflux; | Example 1 : Methyl 4-{6-[4-(2-piperidin-l-ylethoxy)phenyllpyrazolo[l,5-alpyrimdin-3-vUthiophene- 2-carboxylate; Step 1 : methyl 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)thiophene-2-carboxylate; 4-Bromothiophene-2-carboxylic acid (0.418 g, 2 mmol) was dissolved in methanol (1 mL), and concentrated sulfuric acid (0.039 g, 0.4 mmol) was added. The mixture was refluxed for 1O h, poured into water, and subjected to 3-fold extraction with ethyl acetate. The organic layer was washed with K2CO3- solution, concentrated, dried over MgSO4, filtered and evaporated to give methyl 4-bromothiophene-2- carboxylate, weight 0.4 g (90% yield).A flask containing PdCl2(dppf) (0.32 g, 0.43 mmol), dppf (0.24 g, 0.43 mmol), KOAc (4.23 g, 0.043 mol), and pinacolediborone (5.5 g, 0.021 mol) was flushed with argon, then a solution of the ester from the foregoing step (3.2 g, 0.014 mol) in dioxane (60 mL) was added. The mixture was stirred at 850C under argon atmosphere for 40 h. Water (5-fold excess) was added, and the mixture was subjected to 3-fold extraction with ethyl acetate. The organic layer was washed with brine, concentrated, dried over MgSO4, filtered, and evaporated to give the crude methyl 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)thiophene- 2-carboxylate (5.1 g, purity 85% according to 1H NMR data). This crude boronate was used without further purification. |
With sulfuric acid;Heating / reflux; | Step 2 4-Bromo-thiophene-2-carboxylic acid (12.85g), CH30H (360 mL) and H2SO4 (95-98%, 6mL) were refluxed overnight. The solution was basified and evaporated to remove the organic solvent. The residue was extracted with EtOAc. The organic layer was washed with water and brine, then dried over Na2SO4, evaporated to give the product the solvent gave the product 4-Bromo-thiophene-2-carboxylic acid methyl ester (13 g). | |
With thionyl chloride; at -20℃; for 2.08333h;Reflux; | 4-bromo-2-thiophenecarboxylic acid (3.0 g) was dissolved in anhydrous methanol (30 mL) and cooled to -20 C.Then, thionyl chloride (5.1 g) was slowly added dropwise to the above mixture.After stirring for 5 minutes, the temperature was raised to reflux and the reaction was carried out for 2 h.The reaction was quenched with water and extracted with EtOAc.The extract is washed with saturated brine.After drying, it was concentrated to give a crude material (yellow oil, 3.24 g). | |
With thionyl chloride; for 6h;Reflux; | To a stirring solution of 4-bromo-2-thiophenecarboxylic acid (3g, 14.5mmol) in methanol (25mL) was added thionyl chloride (1.74g, 14.5mmol). Reaction mixture was heated to reflux and stirred for 6h. Upon completion, the residue was taken up in ice water (60mL). The pH was adjusted to 9-10 with saturated sodium carbonate solution. The aqueous phase was extracted with ethyl acetate (40mL×3). The combined organic phase was washed twice with saturated brine (20mL×2) and dried over anhydrous MgSO4. After filtering out MgSO4, the solvent of filtrate was removed in vacuo to afford crude product of title compound as a pale-yellow oil which was used for next step directly. Yield: 98%; 1H NMR (300MHz, CDCl3) delta: 7.69 (s, 1H), 7.45 (s, 1H), 3.90 (s, 3H). MS (m/z): [M+H]+ 221.0, 223.0. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
98% | With sulfuric acid; In methanol; at 65℃; for 17h; | A few drops of concentrated sulphuric acid are added to a solution of 5.0 g of the compound obtained during Stage 1 of Preparation 1 in 25 ml of methanol. The reaction medium is stirred at 65 C. for 17 hours and is then concentrated under reduced pressure. The oily residue obtained is dissolved in ethyl acetate (200 ml), washed with water (3×100 ml), dried over sodium sulphate and then concentrated under reduced pressure in order to produce 5.24 g of the desired product. Yield: 98% 1H NMR (CDCl3) delta (ppm): 3.90 (s, 3H), 7.45 (s, 1H), 7.70 (s, 1H) |
95% | With thionyl chloride; In methanol; dichloromethane; | b) Methyl 4-bromothiophene-2-carboxylate To a cooled (-20 C.) solution of 6.02 g (29.1 mmol) of 4-bromothiophene-2-carboxylic acid (as prepared in the previous step) in 100 mL of anhyd MeOH under nitrogen was added 2.55 mL (34.9 mmol) of thionyl chloride dropwise at a rate to keep the temperature below -5 C. (ca. 8-10 min). After stirring for 1 h at room temperature, the mixture was refluxed for 8 h, cooled, and concentrated in vacuo. The resulting 6.7 g of pale amber oil was passed through a 150 g pad of silica gel with ca. 600 mL of CH2Cl2 (discarding the first 120 mL which contained a minor impurity) to afford, after concentration in vacuo, the title compound as a colorless oil (6.11 g, 95%). 1H-NMR (300 MHz, CDCl3) delta7.69 (d, 1 H, J=1.5 Hz), 7.45 (d, 1 H, J=1.5 Hz), and 3.90 (s, 3 H). |
95% | With thionyl chloride; In methanol; dichloromethane; | b) Methyl 4-bromothiophene-2-carboxylate To a cooled (-20 C.) solution of 6.02 g (29.1 mmol) of 4-bromothiophene-2-carboxylic acid (as prepared in the previous step) in 100 mL of anhyd MeOH under nitrogen was added 2.55 mL (34.9 mmol) of thionyl chloride dropwise at a rate to keep the temperature below -5 C. (ca. 8-10 min). After stirring for 1 h at room temperature, the mixture was refluxed for 8 h, cooled, and concentrated in vacuo. The resulting 6.7 g of pale amber oil was passed through a 150 g pad of silica gel with ca. 600 mL of CH2Cl2 (discarding the first 120 mL which contained a minor impurity) to afford, after concentration in vacuo the title compound as a colorless oil (6.11 g, 95%). 1H-NMR (300 MHz, CDCl3) delta 7.69 (d, 1H, J=1.5 Hz), 7.45 (d, 1H, J=1.5 Hz), and 3.90 (s, 3H). |
95% | With thionyl chloride; In methanol; dichloromethane; | b 4-Bromothiophene-2-carboxylic acid Methyl Ester To a dry flask under N2 with a stirbar was added 6 g (29.1 mmol) of 4-bromothiophene-2-carboxylic acid (as prepared in the previous step) and dry methanol (100 mL). The solution was cooled in an ice-salt bath for 15 min and 2.55 mL (34.9 mmol) of thionyl chloride was added over 15 min, keeping the temperature <-5 C. The reaction mixture was stirred on the ice-salt bath for an additional 15 min, then for 1 h at rt, and finally refluxed for 8 h under N2. The resulting solution was cooled and concentrated to 6.7 g of pale amber oil. This oil was passed through 150 g of silica with ~600 mL CH2Cl2 (discarded the first 120 mL which contained minor impurities and no ester). The solvent was removed in vacuo to afford 6.11 g (95% yield) of the title compound as a colorless solid, which was used in the next step without further purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
78% | With potassium phosphate;tetrakis(triphenylphosphine) palladium(0); In 1,2-dimethoxyethane; at 80℃; for 3h; | (4-Nitrophenyl) boronic acid (1.2 equivalents), tetrakis (TRIPHENYLPHOSPHINE) palladium (0) (0.03 equivalent) and 2. 0M potassium phosphate solution (2.1 equivalents) are added to a solution under nitrogen of methyl 4-BROMOTHIOPHENE-2-CARBOXYLATE in 3.0 ml of degassed DME. The reaction medium is then stirred for 3 hours at 80oC, diluted with ethyl acetate (20 ml), washed with water (2X15 ml), dried over sodium sulphate, filtered and concentrated under reduced pressure. Chromatography of the residue on silica gel (98/2 dichloromethane/methanol) allows 1.94 g of the expected product to be isolated. Yield: 78% H NMR (CDC13) 5 (PPM) : 3.92 (s, 3H), 7.75 (d, 2H), 7.82 (s, 1H), 8.12 (s, 1H), 8.30 (d, 2H) |
78% | With potassium phosphate;tetrakis(triphenylphosphine) palladium(0); In 1,2-dimethoxyethane; water; at 80℃; for 3h; | To a solution of <strong>[62224-16-2]methyl 4-bromothiophen-2-carboxylate</strong> and 1.2 equivalents of (4-nitrophenyl) boronic acid in DME were added 2. [1] equivalents of a 2.0 M solution of potassium phosphate and 0.03 equivalent of tetrakis (triphenylphosphie) palladium (0). After stirring at [80XB0;C] for 3 hours the mixture was concentrated under reduced pressure. The residue was diluted with ethyl acetate, filtered over Celite, washed with water, dried over sodium sulfate, and then concentrated under vacuum. The residue was purified on a silica gel column using 9: [1] cyclohexane: ethyl acetate to yield 1.94 g (78%) of the desired compound. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium carbonate;methyl (triphenylphosphoranylidene)acetate; In tetrahydrofuran; water; at 90 - 100℃; | Step 3 4-Bromo-thiophene-2-carboxylic acid methyl ester (8.67g), 4-Formylphenylboronic acid (13 g), Pd (PPh3) 4 (2.08g), THF (100mL), Na2CO3 aqueous solution (100 mL, 2M) were refluxed overnight (90~100C), then extracted the reaction mixture with EtOAc, and washed the organic layer by 5% NaOH solution, followed by water and brine, then dried over Na2SO4, After evaporation, the residue was washed with Et20 and afforded 4- (4- Formyl-phenyl)-thiophene-2-carboxylic acid methyl ester (7 g). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In sulfuric acid; | c 4-Bromo-5-nitrothiophene-2-carboxylic acid Methyl Ester The nitrating mixture (HNO3 d=1.42, 2 mL; concentrated H2SO4, 6 mL) was slowly added with stirring, at -5 to -10 C., to <strong>[62224-16-2]4-Bromothiophene-2-carboxylic acid methyl ester</strong> (3 g, 13.57 mmol) dissolved in concentrated H2SO4 (10 mL). After being kept at -5 to -10 C. for 30 min. the mixture was poured over crushed ice. The solid precipitate was separated by filtration and washed with water and dried over P2O5 to give 3.7 g of 4-bromo-5-nitrothiophene-2-carboxylic acid methyl ester as a tan solid, which was used in the next step without further purification. | |
With sulfuric acid; nitric acid; at -10 - -5℃; for 0.5h; | The nitrating mixture (HNO3 d =1.42, 2 ML ; concentrated H2SO4, 6 mL) was slowly added with stirring, AT-5o TO-10oC, to 4-Bromothiophene-2- carboxylic acid methyl ester (3 g, 13.57 mmol) dissolved in concentrated H2S04 (10 mL). After being kept at-5 to-10oC for 30 min. the mixture was poured over crushed ice. The solid precipitate was separated by filtration and washed with water and dried over P205 to give 3.7 g of 4-bromo-5- nitrothiophene-2-carboxylic acid methyl ester as a tan solid, which was used in the next step without further purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
47.3% | With sodium carbonate;tetrakis(triphenylphosphine) palladium(0); In 1,4-dioxane; water; at 20 - 60℃; for 66h; | 2.72a. methyl 4-(4-chloro-phenyl)-thiophene-2-carboxylate 420 mg (1.25 mmol) of <strong>[62224-16-2]methyl 4-bromo-thiophene-2-carboxylate</strong> are dissolved in 10 mL dioxane and 5 mL 2M Na2CO3 solution. 196 mg (0.06 mmol) of 4-chloro-phenyl-boric acid and 72 mg (0.06 mmol) of tetrakis-(triphenylphosphine)-palladium are added successively, the reaction is refluxed for 6 h and stirred for a further 60 h at RT. After being heated again, the hot reaction solution is suction filtered through a glass fibre filter, washed with dioxane, combined with semisaturated NaHCO3 solution and extracted with EtOAc. The combined organic phases are dried over MgSO4. After elimination of the drying agent and solvent the residue is purified by column chromatography on silica gel (petroleum ether/ethyl acetate 9:1). Yield: 150 mg (47.3% of theory); C12H9ClO2S (M=252.72); calc.: molar peak (M+H)+: 253/255 fnd.: molar peak (M+H)+: 253/255; Retention time HPLC: 6.21 min (method B). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
EXAMPLE 3 Preparation of methyl 4-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-anthryl)-2-thiophene carboxylate Following the basic procedure of Example 1, beginning with 9.5 g (30 mmol) of 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-bromoanthracene and 4.6 g (21 mmol) of <strong>[62224-16-2]methyl 4-bromo-2-thiophenecarboxylate</strong>, 2.87 g (36%) of the expected methyl ester were obtained in the form of an amorphous solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium acetate;1,1'-bis-(diphenylphosphino)ferrocene; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; In 1,4-dioxane; at 85℃; for 40h; | Example 1 : Methyl 4-{6-[4-(2-piperidin-l-ylethoxy)phenyllpyrazolo[l,5-alpyrimdin-3-vUthiophene- 2-carboxylate; Step 1 : methyl 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)thiophene-2-carboxylate; 4-Bromothiophene-2-carboxylic acid (0.418 g, 2 mmol) was dissolved in methanol (1 mL), and concentrated sulfuric acid (0.039 g, 0.4 mmol) was added. The mixture was refluxed for 1O h, poured into water, and subjected to 3-fold extraction with ethyl acetate. The organic layer was washed with K2CO3- solution, concentrated, dried over MgSO4, filtered and evaporated to give methyl 4-bromothiophene-2- carboxylate, weight 0.4 g (90% yield).A flask containing PdCl2(dppf) (0.32 g, 0.43 mmol), dppf (0.24 g, 0.43 mmol), KOAc (4.23 g, 0.043 mol), and pinacolediborone (5.5 g, 0.021 mol) was flushed with argon, then a solution of the ester from the foregoing step (3.2 g, 0.014 mol) in dioxane (60 mL) was added. The mixture was stirred at 850C under argon atmosphere for 40 h. Water (5-fold excess) was added, and the mixture was subjected to 3-fold extraction with ethyl acetate. The organic layer was washed with brine, concentrated, dried over MgSO4, filtered, and evaporated to give the crude methyl 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)thiophene- 2-carboxylate (5.1 g, purity 85% according to 1H NMR data). This crude boronate was used without further purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
66% | With potassium carbonate;tetrakis(triphenylphosphine) palladium(0); In 1,4-dioxane; water; at 70℃; for 2h; | To a solution of <strong>[62224-16-2]methyl 4-bromo-2-thiophenecarboxylate</strong> (1.0 g, 4.52 mmol) in dioxane/H2O (5:1 , 6 mL) was added K2CO3 (1.86 g, 13.5 mmol), tetrakistriphenylphosphine Pd(O) (260 mg, 0.23 mmol) and 1 -ethyl-5-(4, 4,5,5- tetramethyl-1 ,3,2-dioxaborolan-2-yl)-1 /-/-pyrazole(1.3 g, 5.85 mmol). The reaction mixture was heated to 70 C in a sealed tube. After 2h, the reaction mixture was concentrated under vacuum and purified on silica (hex/EtOAc, 20-40%) to afford methyl 4-(1 -ethyl-1 H-pyrazol-5-yl)-2-thiophenecarboxylate (0.7 g, 66%) as a light yellow solid: LC-MS (ES) m/z = 237 (M+H)+.To a solution of the above compound (0.5 g, 2.11 mmol) in THF (10 mL) was added NCS (0.364g, 2.74 mmol). The reaction mixture was heated to 70 C under nitrogen. After 2h, the reaction mixture was concentrated under vacuum and purified on silica (Hexanes/EtOAc, 10-20%) to afford the title compound (0.45 g, 78%) as a light yellow solid: LC-MS (ES) m/z 271 (M+H)+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With tetrakis(triphenylphosphine) palladium(0); potassium carbonate; In 1,4-dioxane; water; at 80℃; for 18h;Sealed tube; | To a solution of methyl 4-bromothiophene-2-car- boxylate (1.00 g, 4.52 mmol) in dioxane/H20 (30:3 mE) was added K2C03 (2.69 g, 19.45 mmol), tetrakistriphenylphosphine Pd(O) (0.78 g, 0.678 mmol), and 5-(5,5-dimethyl-1, 3,2-dioxaborinan-2-yl)-1 -methyl-i H-pyrazole (2.68 g,12.89 mmol). The reaction mixture was heated to 80 C. in a sealed tube for 18 h. The reaction solution was concentrated under vacuum and purified on silica gel (hexanes/ EtOAc, 4:1) to give the title compound methyl 4-(i-methyl- 1H-pyrazol-5-yl)thiophene-2-carboxylate (1.01 g, 100%) as yellow solid. ?H NMR (400 MHz, DMSO-d): oe 8.16 (d, 1H, J=i.6 Hz), 8.02 (d, 1H, J=i.6 Hz), 7.44 (d, 1H=2.0 Hz), 6.56 (d, 1H, J=2.0 Hz), 3.93 (s, 3H), 3.85 (s, 3H); MS (ESI):Calcd, for C1OH1ON2O2S: 222.1, found 223.1 (M+i). |
With potassium carbonate;bis(tri-t-butylphosphine)palladium(0); In 1,4-dioxane; water; at 80℃; for 1h; | To a solution of <strong>[62224-16-2]methyl 4-bromo-2-thiophenecarboxylate</strong> (1 g, 4.52 mmol) in dioxane/H2O (5:1 , 16 ml.) was added K2CO3 (2.7 g, 19 mmol), bis(tri-t- butylphosphine)palladium(O) (116 mg, 0.226 mmol) and 5-(5,5-dimethyl-1 ,3,2- dioxaborinan-2-yl)-1-methyl-1 H-pyrazole (1.2 g, 5.88 mmol). The reaction mixture was heated to 80 C in a sealed tube. After 1 h, the reaction was partitioned <n="136"/>between H2O-DCM and the aqueous phase was extracted several times with DCM. The combined organic fractions were dried over Na2SO4, concentrated and used directly: LCMS (ES) m/z 223 (M+H)+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With caesium carbonate; 4,5-bis(diphenylphos4,5-bis(diphenylphosphino)-9,9-dimethylxanthenephino)-9,9-dimethylxanthene;palladium diacetate; In 1,4-dioxane; at 130℃;Inert atmosphere; | To a stirred solution of Int-2 (0.5 g, 2.26 mmol) in THF (35 mL) was added Int-1 (0.51 g, 2.26 mmol) followed by Pd(OAc)2 (105 mg, 0.45 mmol), xanthpos (265 mg, 0.497 mmol) and CS2CO3 (1.35 g, 4.07 mmol). The reaction mixture was degassed under vacuum, bubbled with N2 for 10 minutes and stirred at 130 C. in a sealed tube for 20 hours. The reaction mixture was concentrated under reduced pressure and was purified by column chromatography to isolate product and a very close spot together. This mixture of two compounds (int-3+close impurity) was used directly in the next step. (Crude yield: 0.25 g). Mass (m/z): 366.0 [M++1]. 1H NMR (200 MHz, dmso-d6): delta 10.18 (s, 1H), 9.72 (brs, 1H), 8.59 (d, J=5.2 Hz, 1H), 7.98 (s, 1H), 7.62 (d, J=8 Hz, 1H), 7.42 (t, J=5.2 Hz, 1H), 7.18 (d, J=5.2 Hz, 1H), 7.02 (t, J=5.2 Hz, 1H), 7.11 (s, 1H), 3.82 (s, 3H), 2.62 (s, 3H). To a stirred solution of Int-3 (crude 0.25 g) in THF: MeOH: H2O (2:1:2) (25 ml) was added LiOH (0.25 g, wt/wt) at 0 C. and stirred while heating at 50 C. for 6 hours. Volatiles from the reaction mixture were distilled off under reduced pressure. Water (15 mL), DCM (50 ml) were added and stirred vigorously for 15 minutes, the aqueous layer was separated and treated again with DCM (35 ml). The aqueous layer was concentrated to half of its volume under reduced pressure and was acidified to about pH 5-6 with concentrated HCl. The precipitated solid was filtered and dried under vacuum to afford pure Int-4 (0.12 g). Mass (m/z): 352.0 [M++1]. 1H NMR (200 MHz, dmso-d6): delta 9.98 (s, 1H), 9.67 (brs, 1H), 8.60 (d, J=5.2 Hz, 1H), 7.65-7.59 (m, 3H) 7.42 (t, J=8.4 Hz, 2H), 7.15-6.98 (m, 2H), 2.67 (s, 3H). To a stirred solution of Int-4 (120 mg, 0.32 mmol) in DMF (10 mL) at 10 C. was added EDCI.HCl (136 mg, 0.71 mmol), HOBt (45 mg, 3.21 mmol), NH2OTHP (76 mg, 0.64 mmol) and finally DIPEA (0.143 mL, 0.80 mmol) was added and stirred at room temperature for 16 hours. The reaction was quenched with water (45 mL) and extracted with EtOAC (40 mL). The organic layer was washed with water (2×15 mL), brine (30 mL), dried over Na2SO4 and concentrated under vacuum to obtain crude compound which was purified by column chromatography eluting pure compound with 2% MeOH-DCM to afford pure Int-5 (50 mg, 33%). Mass (m/z): 451.2 [M++1]. 1H NMR (200 MHz, dmso-d6): delta 11.67 (brs, 1H), 10.06 (s, 1H), 9.74 (brs, 1H), 8.54 (d, J=5.2 Hz, 1H), 7.84 (s, 1H), 7.72 (s, 1H), 7.64 (d, J=9 Hz, 1H), 7.43 (t, J=7.8 Hz, 1H), 7.10 (d, J=5.6 Hz, 1H), 7.02 (t, J=5.8 Hz, 1H), 4.95 (s, 1H), 4.03 (s, 1H), 3.54 (s, 1H), 2.65 (s, 3H), 1.71 (s, 3H), 1.54 (s, 3H). To a stirred solution of Int-5 (50 mg, 0.105 mmol) in MeOH (4 mL) at 0-5 C. was added concentrated HCl (0.5 mL) dropwise and stirred at room temperature for 16 hours. The precipitated solid was filtered and dried under vacuum; this was then suspended in saturated aqueous HCO3 solution (5 mL) and stirred for 0.5 hours, this was filtered, washed with water (2 ml) and dried under vacuum to afford the title compound as a light brown solid (30 mg, 77%). Mass (m/z): 367.1[M++1]. 1H NMR (500 MHz, dmso-d6): delta 11.28 (brs, 1H), 10.00 (s, 1H), 9.78 (brs, 1H), 8.98 (brs, 1H), 8.54 (d, J=5.5 Hz, 1H), 7.64 (d, J=9 Hz, 1H), 7.59 (brs, 1H), 7.45-7.42 (m, 1H), 7.09 (d, J=5.5 Hz, 1H), 7.05-7.03 (m, 2H), 2.66 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With potassium carbonate;bis(tri-t-butylphosphine)palladium(0); In 1,4-dioxane; water; at 85℃; for 6h;Sealed flask; | Example 2; Preparation of Lambda/-{(1 S)-2-amino-1-[(3,4-difluorophenyl)methyl1ethyl}-5-chloro-4-(1 /-/- pyrazol-4-yl)-2-thiophenecarboxamide; a) 1 ,1-dimethylethyl 4-{5-[(methyloxy)carbonyl]-3-thienyl}-1 H-pyrazole-1-carboxylate; To a 75 ml. sealed flask was added <strong>[62224-16-2]methyl 4-bromo-2-thiophenecarboxylate</strong> (1.144 g, 5.17 mmol) [prepared according to the procedure of Example 1], potassium carbonate (2.31 g, 16.71 mmol), 1 ,1-dimethylethyl 4-(4,4, 5, 5-tetramethyl-1 , 3,2- dioxaborolan-2-yl)-1 H-pyrazole-1-carboxylate (1.656 g, 5.63 mmol) and bis(tri-t- butylphosphine)palladium(O) (35.1 mg, 0.069 mmol) in 1 ,4-dioxane (20 ml.) and H2O (4 ml_). After stirring for 6 hours at 85 0C, the reaction solution was diluted with CHCI3 (75 ml.) and washed with H2O. The organic layer was dried over Na2SO4, filtered and concentrated. The residue was adsorbed onto silica gel and eluted with [Hexanes/EtOAc, 2:1 ] to give the product [774 mg, quant.] as a yellow oil: LCMS (ES) m/z 309 (M+H)+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With potassium carbonate;bis(tri-t-butylphosphine)palladium(0); In 1,4-dioxane; water; at 85℃; for 3h;Sealed flask; | b) methyl 4-[1-(phenylmethyl)-1 H-pyrazol-4-yl]-2-thiophenecarboxylate; To a 75 ml. sealed flask was added <strong>[62224-16-2]methyl 4-bromo-2-thiophenecarboxylate</strong> (1.6 g, 7.2 mmol), potassium carbonate (3.2 g, 23 mmol), 1-(phenylmethyl)-4-(4,4,5,5- tetramethyl-1 ,3,2-dioxaborolan-2-yl)-1 H-pyrazole (2.4 g, 8.1 mmol) and bis(tri-t- butylphosphine)palladium(O) (53 mg, 0.104 mmol) in 1 ,4-dioxane (20 ml.) and H2O (4 ml_). After stirring for 3 hours at 85 0C, the reaction solution was diluted with CHCI3 (75 ml.) and washed with H2O. The organic layer was dried over Na2SO4, filtered and concentrated. The reaction residue was purified on silica gel [Hexanes/EtOAc, 5:1 ] to give the product [2.4 g, quant.] as a yellow oil: LCMS (ES) m/z 258 (M+H)+. |
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