Structure of 1591-38-4
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Selective and Cell-Active PBRM1 Bromodomain Inhibitors Discovered through NMR Fragment Screening
Shifali Shishodia ; Raymundo Nuñez ; Brayden P. Strohmier ; Karina L. Bursch ; Christopher J. Goetz ; Michael D. Olp , et al.
Abstract: PBRM1 is a subunit of the PBAF chromatin remodeling complex that uniquely contains six bromodomains. PBRM1 can operate as a tumor suppressor or tumor promoter. PBRM1 is a tumor promoter in prostate cancer, contributing to migratory and immunosuppressive phenotypes. Selective chemical probes targeting PBRM1 bromodomains are desired to elucidate the association between aberrant PBRM1 chromatin binding and cancer pathogenesis and the contributions of PBRM1 to immunotherapy. Previous PBRM1 inhibitors unselectively bind SMARCA2 and SMARCA4 bromodomains with nanomolar potency. We used our protein-detected NMR screening pipeline to screen 1968 fragments against the second PBRM1 bromodomain, identifying 17 hits with Kd values from 45 μM to >2 mM. Structure–activity relationship studies on the tightest-binding hit resulted in nanomolar inhibitors with selectivity for PBRM1 over SMARCA2 and SMARCA4. These chemical probes inhibit the association of full-length PBRM1 to acetylated histone peptides and selectively inhibit growth of a PBRM1-dependent prostate cancer cell line.
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Purchased from AmBeed: 77326-36-4 ; 104-87-0 ; 2148-56-3 ; 63329-53-3 ; 1591-37-3 ; 387-45-1 ; 936-08-3 ; 1123-56-4 ; 2819989-75-6 ; 703-80-0 ; 1885-29-6 ; 115643-59-9 ; 15764-16-6 ; 487-68-3 ; 145737-61-7 ; 5779-95-3 ; 88-68-6 ; 6575-11-7 ; 77326-62-6 ; 88-65-3 ; 4635-59-0 ; 5779-94-2 ; 56043-01-7 ; 5779-93-1 ; 1591-38-4 ; 446-52-6 ; 1108790-90-4 ; 62803-47-8 ; 1885-31-0 ; 620-23-5 ; 54166-95-9 ; 22179-72-2 ; 529-20-4 ; 100-52-7 ; 123-11-5 ; 1711-06-4 ; 454-89-7 ; 170875-01-1 ; 883032-29-9 ; 2819989-61-0 ; 1915012-21-3 ; 2819989-58-5 ; 2819989-60-9 ; 2819989-57-4 ; 2819989-68-7 ; 2819989-67-6 ; 111478-13-8 ; 73096-42-1 ; 2835-78-1 ; 118-92-3 ; 22458-07-7 ; 80258-99-7 ; 24782-64-7 ; 175204-03-2 ; 97-96-1 ; 780802-33-7 ; 89-98-5
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| CAS No. : | 1591-38-4 |
| Formula : | C8H10N2O2 |
| M.W : | 166.18 |
| SMILES Code : | O=C(N)C1=C(OC)C=CC=C1N |
| MDL No. : | MFCD18389707 |
| InChI Key : | AQAHTARDEJNYPN-UHFFFAOYSA-N |
| Pubchem ID : | 12264814 |
| GHS Pictogram: |
|
| Signal Word: | Warning |
| Hazard Statements: | H315-H319 |
| Precautionary Statements: | P264-P280-P302+P352-P305+P351+P338-P332+P313-P337+P313-P362 |
* 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 |
|---|---|---|
| 40% | With water; hydrazine hydrate; In ethanol; at 45℃; for 4h;Reflux; | Step 2 To a suspension of 2-methoxy-6-nitrobenzonitrile (2.60 g, 14.6 mmol) in ethanol (60 mL) was added hydrazine monohydrate (1.53 g, 30.7 mmol). While heating the mixture to 45 C., Raney Ni (600 mg) was added in several portions, and the mixture was stirred at 60 C. for 2 hrs. Raney Ni (300 mg) was added again, and the mixture was heated under reflux for 2 hrs. After allowing to cool to room temperature, insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. Ethyl acetate was added to the obtained concentrated residue, and the mixture was extracted with 1N hydrochloric acid. The aqueous layer was basified with 1N aqueous sodium hydroxide solution and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure to give 2-amino-6-methoxybenzamide as a brown powder (980 mg, 40%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 79% | With water; potassium carbonate; In water; at 150℃; for 0.5h;Microwave irradiation; | General procedure: Adapted from a literature procedure,1 the appropriate organonitrile (1.0 eq.) and K2CO3(0.2eq.)wereaddedtoamicrowavetubewithastir-barwithdeionizedwater(8.5mLpermmolsubstrate).Afterirradiationundermicrowaveat150Cfor30minutes,thereactionmixturewascooled,extractedwithEtOAc(320mL),thecombinedphasesdriedoverMgSO4andexcesssolventremovedinvacuo.TheresiduewaspurifiedbyFCC,ifrequired,togivethetitlecompound. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| EXAMPLE 40 2'-Carbamoyl-3'-methoxyoxanilic acid methyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 3, giving 4.24 g of the title compound, m.p. 195-198 C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.38; H, 4.80; N, 11.11. Found: C, 52.30; H, 4.94; H, 11.40. | ||
| EXAMPLE 23 2'-Carbamoyl-3'-methoxyoxanilic acid methyl ester. 96 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 12, giving 4.24 g. of the title compound, m.p. 195-198 C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.28; H, 4.80; N, 11.11. Found: C, 52.30; H, 4.94; H, 11.40. | ||
| EXAMPLE 23 2'-Carbamoyl-3'-methoxyoxanilic acid methyl ester. 96 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 12, giving 4.24 g. of the title compound, m.p. 195-198 C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.28; H, 4.80; N, 11.11: Found: C, 52.30; H, 4.94; H, 11.40. |
| EXAMPLE 23 2'-Carbamyl-3'-methoxyoxanilic acid methyl ester. 96. 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 12, giving 4.24 g. of the title compound, m.p. 195-198 C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.28; H, 4.80; N, 11.11. Found: C, 52.30; H, 4.94; H, 11.40. | ||
| EXAMPLE 40 2'-Carbamoyl-3'-methoxyoxanilic acid methyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 3, giving 4.24 g of the title compound, m.p. 195-198 C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.38; H, 4.80; N, 11.11. Found: C, 52.30; H, 4.94; H, 11.40. | ||
| EXAMPLE 40 2'-Carbamoyl-3'-methoxyoxanilic acid methyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 3.04 ml. (0.033 mole) of methyl oxalyl chloride in a manner similar to example 3, giving 4.24 g of the title compound, m.p. 195-198C., after crystallization from methanol. Elemental Analysis for C11 H12 N2 O5: Calc'd: C, 52.38; H, 4.80; N, 11.11. Found: C, 52.30; H, 4.94; H, 11.40. |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 100% | With triethylamine; In tetrahydrofuran; at 35℃; for 2h;Cooling with ice; | Step 3 (1550) To a solution of <strong>[1591-38-4]2-amino-6-methoxybenzamide</strong> (960 mg, 5.78 mmol) and triethylamine (701 mg, 6.93 mol) in THF (20 mL) was added dropwise ethyl chloroglyoxylate (868 mg, 6.36 mmol) under ice-cooling, and the mixture was stirred at room temperature for 2 hrs. The reaction mixture was diluted with ethyl acetate, the mixture was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The obtained concentrated residue was washed with ethanol, ethyl ((2-(aminocarbonyl)-3-methoxyphenyl)amino)(oxo)acetate to give a yellow powder (1.56 g, 100%). |
| EXAMPLE 34 2'-Carbamoyl-3'-methoxyoxanilic acid ethyl ester. 100/94 6-Amino-o-anisamide (8.75 g, 0.0527 mole) is condensed with 6.2 ml (0.0554 mole) of ethyl oxalyl chloride in a manner similar to example 3, giving 8.35 g of the title compound, m.p. 170-173 C., after crystallization from ethanol. Elemental Analysis for C12 H14 N2 O5: Calc'd: C, 54.13; H, 5.30; N, 10.52. Found: C, 54.36; H, 5.20; N, 10.66. | ||
| EXAMPLE 18 2'-Carbamoyl-3'-methoxyoxanilic acid ethyl ester. 100/94. 6-Amino-o-anisamide (8.75 g., 0.0527 mole) is condensed with 6.2 ml. (0.0554 mole) of ethyl oxalyl chloride in a manner similar to example 12, giving 8.35 g. of the title compound, m.p. 170-173 C., after crystallization from ethanol. Elemental Analysis for C12 H14 N2 O5: Calc'd: C, 54.13; H, 5.30; N, 10.52. Found: C, 54.36; H, 5.20; N, 10.66. |
| EXAMPLE 18 2'-Carbamoyl-3'-methoxyoxanilic acid ethyl ester. 100/94 6-Amino-o-anisamide (8.75 g., 0.0527 mole) is condensed with 6.2 ml. (0.0554 mole) of ethyl oxalyl chloride in a manner similar to example 12, giving 8.35 g. of the title compound, m.p. 170-173 C., after crystallization from ethanol. Elemental Analysis for C12 H14 N2 O5: Calc'd: C, 54.13; H, 5.30; N, 10.52: Found: C, 54.36; H, 5.20; N, 10.66. | ||
| EXAMPLE 18 2'-Carbamyl-3'-methoxyoxanilic acid ethyl ester. 100/94. 6-Amino-o-anisamide (8.75 g., 0.0527 mole) is condensed with 6.2 ml. (0.0554 mole) of ethyl oxalyl chloride in a manner similar to example 12, giving 8.35 g. of the title compound, m.p. 170-173 C., after crystallization from ethanol. Elemental Analysis for C12 H14 N2 O5: Calc'd: C, 54.13; H, 5.30; N, 10.52. Found: C, 54.36; H, 5.20; N, 10.66. | ||
| EXAMPLE 34 2'-Carbamoyl-3'-methoxyoxanilic acid ethyl ester. 100/94 6-Amino-o-anisamide (8.75 g, 0.0527 mole) is condensed with 6.2 ml (0.0554 mole) of ethyl oxalyl chloride in a manner similar to example 3, giving 8.35 g of the title compound, m.p. 170-173C., after crystallization from ethanol. Elemental Analysis for C12 H14 N2 O5: Calc'd: C, 54.13; H, 5.30; N, 10.52. Found: C, 54.36; H, 5.20; N, 10.66. | ||
| In pyridine; dichloromethane; | EXAMPLE 1 [2-(aminocarbonyl)-3-methoxyphenylamino]oxoacetic acid ethyl ester 6-Amino-o-anisamide(8.75 g.) is condensed with 6.2 ml. of ethyl oxalyl chloride in 100 ml. methylene chloride in the presence of 9.6 ml. of pyridine at 10 C. Aqueous work-up and evaporation of the methylene chloride followed by recrystallization from ethanol gives the title compound, m.p. 170-173 C. Anal. Calcd. for C12 H14 N2 O5: C, 54.13; H, 5.30; N, 10.52. Found: C, 54.36; H, 5.20; N, 10.66. Potency: 12.5 mg/kg. |

[ 1591-38-4 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With NaH; In N-methyl-acetamide; | EXAMPLE 49 3'-Methoxy-2'-N-Methylcarbamyloxanilic acid ethyl ester. 72 Slow addition of 4.98 g. (0.03 mole) of 6-amino-o-anisamide to a mixture of 57% NaH (1.32 g., 0.0315 mole) in 50 ml. dimethylformamide was carried out at room temperature. After the evolution of H2 ceased, the mixture was cooled to 3 C. and 2.06 ml. (0.033 mole) of methyliodide was slowly added at 3-5 C. The temperature was allowed to go up to room temperature and stir for 2 hours. The mixture was concentrated, the residue extracted into ethyl acetate-water, the mixture was basified, and the ethyl acetate layer was washed with water, brine and dried. Concentration gave a tan solid that was crystallized (ethanol), giving 0.45 g. (8%) of 6-amino-N-methyl-o-anisamide m.p. 186-189 C. | |
| With NaH; In N-methyl-acetamide; | EXAMPLE 49 3'-Methoxy-2'-methylcarbamoyloxanilic acid ethyl ester. 72 Slow addition of 4.98 g. (0.03 mole) of 6-amino-o-anisamide to a mixture of 57% NaH (1.32 g., 0.0315 mole) in 50 ml. dimethylformamide was carried out at room temperature. After the evolution of H2 ceased, the mixture was cooled to 3 C. and 2.06 ml. (0.033 mole) of methyliodide was slowly added at 3-5 C. The temperature was allowed to go up to room temperature and stir for 2 hours. The mixture was concentrated, the residue extracted into ethyl acetate-water, the mixture was basified, and the ethyl acetate layer was washed with water, brine and dried. Concentration gave a tan solid that was crystallized (ethanol), giving 0.45 g. (8%) Of 6-amino-N-methyl-o-anisamide m.p. 186-189 C. | |
| With NaH; In N-methyl-acetamide; | EXAMPLE 67 3'-Methoxy-2'-methylcarbamoyloxanilic acid ethyl ester. 72 Slow addition of 4.98 g. (0.03 mole) of 6-amino-o-anisamide to a mixture of 57% NaH (1.32 g., 0.0315 mole) in 50 ml. dimethylformamide was carried out at room temperature. After the evolution of H2 ceased, the mixture was cooled to 3 C. and 2.06 ml. (0.033 mole) of methyliodide was slowly added at 3-5 C. The temperature was allowed to go up to room temperature and stir for 2 hours. The mixture was concentrated, the residue extracted into ethylacetate-water, the mixture was basified, and the ethylacetate layer was washed with water, brine and dried. Concentration gave a tan solid that was crystallized (ethanol), giving 0.45 g. (8%) of 6-amino-N-methyl-o-anisamide mp. 186-189 C. |
| With NaH; In N-methyl-acetamide; | EXAMPLE 67 3'-Methoxy-2'-methylcarbamoyloxanilic acid ethyl ester. 72 Slow addition of 4.98 g. (0.03 mole) of 6-amino-o-anisamide to a mixture of 57% NaH (1.32 g., 0.0315 mole) in 50 ml. dimethylformamide was carried out at room temperature. After the evolution of H2 ceased, the mixture was cooled at 3C. and 2.06 ml. (0.033 mole) of methyliodide was slowly added at 3-5C. The temperature was allowed to go up to room temperature and stir for 2 hours. The mixture was concentrated, the residue extracted into ethylacetate-water, the mixture was basified, and the ethylacetate layer was washed with water, brine and dried. Concentration gave a tan solid that was crystallized (ethanol), giving 0.45 g. (8%) of 6-amino-N-methyl-o-anisamide mp. 186-189C. |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| EXAMPLE 42 2'-Carbamoyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 3, giving 4.74 g of the title compound, m.p. 128-132 C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.66; H, 5.93; N, 10.38. | ||
| EXAMPLE 25 2'-Carbamoyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 12, giving 4.74 g. of the title compound, m.p. 128-132 C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00: Found: C, 55.66; H, 5.93; N, 10.38. | ||
| EXAMPLE 25 2'-Carbamoyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 12, giving 4.74 g. of the title compound, m.p. 128-132 C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.66; H, 5.93; N, 10.38. |
| EXAMPLE 25 2'-Carbamyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 12, giving 4.74 g. of the title compound, m.p. 128-132 C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.66; H, 5.93; N, 10.38. | ||
| EXAMPLE 42 2'-Carbamoyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 3, giving 4.74 g of the title compound, m.p. 128-132 C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.66; H, 5.93; N, 10.38. | ||
| EXAMPLE 42 2'-Carbamoyl-3'-methoxyoxanilic acid isopropyl ester. 57 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of isopropyl oxalyl chloride in a manner similar to example 3, giving 4.74 g of the title compound, m.p. 128-132C., after crystallization from benzene. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.66; H, 5.93; N, 10.38. |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| EXAMPLE 41 2'-Carbamoyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 3, giving 4.81 g of the title compound, m.p. 158-161 C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.92; H, 5.93; N, 10.34. | ||
| EXAMPLE 24 2'-Carbamoyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 12, giving 4.81 g. of the title compound, m.p. 158-161 C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00: Found: C, 55.92; H, 5.93; N, 10.34. | ||
| EXAMPLE 24 2'-Carbamoyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 12, giving 4.81 g. of the title compound, m.p. 158-161 C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.92; H, 5.93; N, 10.34. |
| EXAMPLE 24 2'-Carbamyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g., 0.03 mole) is condensed with 4.25 ml. (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 12, giving 4.81 g. of the title compound, m.p. 158-161 C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.92; H, 5.93; N, 10.34. | ||
| EXAMPLE 41 2'-Carbamoyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 3, giving 4.81 g of the title compound, m.p. 158-161 C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.92; H, 5.93; N, 10.34. | ||
| EXAMPLE 41 2'-Carbamoyl-3'-methoxyoxanilic acid n-propyl ester. 96 6-Amino-o-anisamide (4.98 g, 0.03 mole) is condensed with 4.25 ml (0.033 mole) of n-propyl oxalyl chloride in a manner similar to example 3, giving 4.81 g of the title compound, m.p. 158-161C., after crystallization from acetonitrile. Elemental Analysis for C13 H16 N2 O5: Calc'd: C, 55.71; H, 5.75; N, 10.00. Found: C, 55.92; H, 5.93; N, 10.34. |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With NaH; In N-methyl-acetamide; | EXAMPLE 49 3'-Methoxy-2'-methylcarbamoyloxanilic acid ethyl ester. 72 Slow addition of 4.98 g. (0.03 mole) of 6-amino-o-anisamide to a mixture of 57% NaH (1.32 g., 0.0315 mole) in 50 ml. dimethylformamide was carried out at room temperature. After the evolution of H2 ceased, the mixture was cooled to 3 C. and 2.06 ml. (0.033 mole) of methyliodide was slowly added at 3-5 C. The temperature was allowed to go up to room temperature and stir for 2 hours. The mixture was concentrated, the residue extracted into ethyl acetate-water, the mixture was basified, and the ethyl acetate layer was washed with water, brine and dried. Concentration gave a tan solid that was crystallized (ethanol), giving 0.45 g (8%) Of 6-amino-N-methyl-o-anisamide m.p. 186-189 C. Elemental Analysis for C9 H12 N2 O2: Calculated: C, 59.98; H, 6.71; N, 15.55. Found: C, 60.42; H, 7.04; N, 15.42. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With pyridine; In dichloromethane; benzene; | The potassium salt (7.27 g., 0.03 mol.) and 1.5 ml. of pryidine are stirred at 6 C. in 125 ml. of benzene, and 25 ml. of oxalyl chloride is rapidly added. After stirring 1/2 hour at 15 C. the mixture is stripped at 15 C., and scrubbed with two portions of 130 ml. of benzene at 15 C., giving a crude mixture of 1-benzyl-1H-tetrazole-5-carbonyl chloride. This preparation of the acid chloride is kept cold and used immediately for acylation. 1-Benzyl-1H-tetrazole-5-carbonyl chloride (0.06 mol.) is dissolved in methylene chloride, and added to a 5-10 C. solution of <strong>[1591-38-4]2-amino-6-methoxybenzamide</strong> (9.97 g., 0.06 mol.) and 5 ml. of pyridine in 270 ml. of methylene chloride. The reaction solution is stirred for 2 hours at room temperature, washed twice with water, twice with brine and dried over CaCl2. Evaporation of the solvent gives 23 g. of a pink solid which crystallizes from acetonitrile giving 15.7 g. of 1 benzyl-N-[2-carbamoyl-3-methoxyphenyl]-1H-tetrazole-5-carboxamide, m.p. 190-192 C. Analysis for: C17 H16 N6 O3: Calculated: C, 57.95; H, 4.58; N, 23.85; Found: C, 58.39; H, 4.63; N, 23.86. | |
| With pyridine; In dichloromethane; benzene; | The potassium salt (7.27 g., 0.03 mol.) and 1.5 ml. of pyridine are stirred at 6 C. in 125 ml. of benzene, and 25 ml. of oxalyl chloride is rapidly added. After stirring 1/2 hour at 15 C. the mixture is stripped at 15 C., and scrubbed with two portions of 130 ml. of benzene at 15 C., giving a crude mixture of 1-benzyl-1H-tetrazole-5-carbonyl chloride. This preparation of the acid chloride is kept cold and used immediately for acylation. 1-Benzyl-1H-tetrazole-5-carbonyl chloride (0.06 mol.) is dissolved in methylene chloride, and added to a 5-10 C. solution of <strong>[1591-38-4]2-amino-6-methoxybenzamide</strong> (9.97 g., 0.06 mol.) and 5 ml. of pyridine in 270 ml. of methylene chloride. The reaction solution is stirred for 2 hours at room temperature, washed twice with water, twice with brine and dried over CaCl2. Evaporation of the solvent gives 23 g. of a pink solid which crystallizes from acetonitrile giving 15.7 g. of 1 benzyl-N-[2-carbamoyl-3-methoxyphenyl]-1H-tetrazole-5-carboxamide, m.p. 190-192 C. Analysis for C17 H16 N6 O3: Calculated: C, 57.95; H, 4.58; N, 23.85. Found: C, 58.39; H, 4.63; N, 23.86. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 98% | To a solution of 2-amino-6-methoxybenzoic acid (9.0 g, 53.8 mmol) in THF (270 mL) was added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (23.7 g, 123.7 mmol) and hydroxybenzotriazole (23.9 g, 156.0 mmol). The mixture was stirred at rt for 30 min, then N-methylmorpholine (18.2 g, 180.3 mmol) and NH4OH ( 50 vol % in H2O, 36 mL) were added. The reaction mixture was then stirred for 18 h at rt. After that time the reaction was concentrated under reduced pressure and diluted with ethyl acetate (600 mL). The organic phase was washed with brine (2×100 mL), dried over Na2SO4 and concentrated under reduced pressure to give 2-amino-6-methoxybenzamide (8.80 g, 98%) as a light yellow solid: 1H NMR (400 MHz, DMSO-d6): δ 7.55 (br s, 1H), 7.29 (br s, 1H), 7.01 (t, J=8.4 Hz, 1H), 6.36 (br s, 2H), 6.30 (dd, J=8.4, 0.8 Hz, 1H), 6.17 (dd, J=8.0, 1.2 Hz, 1H), 3.76 (s, 3H) | |
| 65% | To a stirred solution of 2-amino-6-methoxy-benzoicacid (3.00 g, 17.9 mmol) in THF (90 mL), EDCI (7.89 g, 41.1 mmol) and HOBt (7.95 g, 51.9 mmol) were added and stirred at room temperature for 30 minutes then N-methylmorpholine (6.15 g, 60.0 mmol) and aqueous 50% v/v NH4OH (12 mL, 171.4 mmol) was added. The mixture was stirred for 16 hours at room temperature. The solvent was removed under reduced pressure and the residue was extracted with ethylacetate (4*100 mL), the combined organic phase was washed with water and brine, and dried over anhydrous sodium sulfate; the solvent was evaporated to give 2-amino-6-methoxy-benzamide as an off-white solid. Yield: 1.90 g, (65%) | |
| 65% | Example 67 Preparation of 2-(3,5-Dimethyl-4-(2-(pyrrolidin-1-yl)ethoxy)phenyl)-5-methoxyquinazolin-4(3H)-one To a stirred solution of 2-amino-6-methoxy-benzoic acid (3.00 g, 17.9 mmol) in THF (90 mL), EDCl (7.89 g, 41.1 mmol) and HOBt (7.95 g, 51.9 mmol) were added and stirred at room temperature for 30 minutes then N-methylmorpholine (6.15 g, 60.0 mmol) and aqueous 50% v/v NH4OH (12 mL, 171.4 mmol) was added. The mixture was stirred for 16 hours at room temperature. The solvent was removed under reduced pressure and the residue was extracted with ethylacetate (4*100 mL), the combined organic phase was washed with water and brine, and dried over anhydrous sodium sulfate; the solvent was evaporated to give 2-amino-6-methoxy-benzamide as an off-white solid. Yield: 1.90 g, (65%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 55% | With toluene-4-sulfonic acid; sodium hydrogensulfite; In N,N-dimethyl acetamide; at 115℃; for 20.0h; | To a solution of 2-amino-6-methoxy-benzamide (1.00 g, 6.01 mmol) and <strong>[1039948-89-4]4-(2-hydroxy-ethoxy)-3,5-dimethyl-benzaldehyde</strong> (1.28 g, 6.59 mmol) in N,N-dimethylacetamide (15 mL) were added NaHSO3 (58.5 wt %, 0.68 g, 6.50 mmol) and p-TSA (0.23 g, 1.20 mmol) and the reaction mixture was heated at 115 C. for 20 hours, and cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure. The residue was diluted with water (50 mL), stirred for 30 minutes, and then filtered. The solid was suspended in dichloromethane (30 mL), stirred for 1 h, filtered, and dried under vacuum to give 2-[4-(2-hydroxyethoxy)-3,5-dimethylphenyl]-5-methoxy-3H-quinazolin-4-one as an off-white solid. Yield: 1.1 g (55%) |
| 55% | With toluene-4-sulfonic acid; sodium hydrogensulfite; In N,N-dimethyl acetamide; at 115℃; for 20.0h; | To a solution of 2-amino-6-methoxy-benzamide (1.00 g, 6.01 mmol) and <strong>[1039948-89-4]4-(2-hydroxy-ethoxy)-3,5-dimethyl-benzaldehyde</strong> (1.28 g, 6.59 mmol) in N,N-dimethylacetamide (15 mL) were added NaHSO3 (58.5 wt %, 0.68 g, 6.50 mmol) and p-TSA (0.23 g, 1.20 mmol) and the reaction mixture was heated at 115 C. for 20 hours, and cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure. The residue was diluted with water (50 mL), stirred for 30 minutes, and then filtered. The solid was suspended in dichloromethane (30 mL), stirred for 1 h, filtered, and dried under vacuum to give 2-[4-(2-hydroxy-ethoxy)-3,5-dimethyl-phenyl]-5-methoxy-3H-quinazolin-4-one as an off-white solid. Yield: 1.1 g (55%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 0.41 g | With toluene-4-sulfonic acid; sodium hydrogensulfite; In N,N-dimethyl acetamide; at 120℃; for 14h; | To a solution of 5-(2-((tert-butyldimethylsilyl)oxy)ethoxy)-6-(4-(methylsulfonyl)phenyl)-picolinaldehyde (0.54 g, 1.50 mmol) and <strong>[1591-38-4]2-amino-6-methoxybenzamide</strong> (0.274 g, 1.65 mmol) in N,N-dimethylacetamide (15 ml) was added NaHSO3 (58.5 wt %, 0.41 g, 2.25 mmol) and p-toluenesulfonic acid monohydrate (0.057 g, 0.30 mmol). The reaction mixture was stirred at 120 C. for 14 h. After that time the reaction was cooled to rt, concentrated under reduced pressure, diluted with water (100 mL) and the precipitated solids were collected by filtration, washed with water and dried under vacuum. The product was washed with diethyl ether and dried to give 2-(5-(2-((tert-butyldimethylsilyl)oxy)ethoxy)-6-(4-(methylsulfonyl)-phenyl)pyridin-2-yl)-5-methoxyquinazolin-4(3H)-one (0.41 g) as a brown solid: ESI MS m/z 582 [M+H]+. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 60% | With toluene-4-sulfonic acid; sodium hydrogensulfite; In N,N-dimethyl acetamide; at 120℃; for 20h; | To a solution of 5-methoxy-6-(4-(methylsulfinyl)phenyl)picolinaldehyde (0.83 g, 3.0 mmol) in N,N-dimethylacetamide (30 mL) was added <strong>[1591-38-4]2-amino-6-methoxybenzamide</strong> (0.50 g, 3.0 mmol) followed by NaHSO3 (0.47 g, 4.5 mmol) and p-toluenesulfonic acid monohydrate (0.57 g, 3.0 mmol). The reaction was heated at 120 C. for 20 h. After that time the reaction was cooled to rt, concentrated under reduced pressure and diluted with water (10 mL) and saturated Na2CO3 (2 mL). The precipitated solids were collected by filtration, washed with water and dried under vacuum. The product was purified by flash column chromatography (silica gel, 98:2 dichloromethane/methanol) followed by trituration with methanol to give 5-methoxy-2-(5-methoxy-6-(4-(methylsulfinyl)phenyl)pyridin-2-yl)quinazolin-4(3H)-one (0.758 g, 60%) as a white solid: mp 308-310 C.; 1H NMR (400 MHz, DMSO-d6): δ 11.36 (br s, 1H), 8.40 (d, J=8.4 Hz, 1H), 8.30 (d, J=8.8 Hz, 2H), 7.84-7.76 (m, 3H), 7.72 (t, J=8.4 Hz, 1H), 7.29 (d, J=7.6 Hz, 1H), 7.03 (d, J=8.4 Hz, 1H), 3.97 (s, 3H), 3.88 (s, 3H), 2.80 (s, 3H); ESI MS m/z 422 [M+H]+. |

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