Structure of 29840-73-1
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CAS No. : | 29840-73-1 |
Formula : | C6H5BrN2O |
M.W : | 201.02 |
SMILES Code : | NC(=O)C1=CC(Br)=NC=C1 |
MDL No. : | MFCD00234156 |
InChI Key : | KCELTDZFDHPTBI-UHFFFAOYSA-N |
Pubchem ID : | 4625407 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H319 |
Precautionary Statements: | P305+P351+P338 |
* 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 |
---|---|---|
at 120℃; for 1.5h; | 2-bromo-isonicotinamide (406.2 mg, 2.021 mmol) and N,N-dimethylformamide diethyl acetal (0.48 ml, 2.80 mmol) were combined and heated to 120C. A short path distillation apparatus was used to collect the ethanol that was liberated during the reaction. The reaction mixture was a light orange solution that slowly turned darker until it had become a dark amber solution. After 1.5 hours, the reaction mixture was cooled to room temperature. The reaction mixture solidified upon cooling and was placed under high vacuum overnight to give the title compound (507.4 mg) as an off-white solid.1H NMR (CD3OD, 500 MHz, ppm) δ 3.27 (s, 3H, NMe), 3.29 (s, 3H, NMe), 8.05 (dd, 1H, ArH), 8.23 (d, 1H, ArH), 8.46 (d, 1H, ArH), 8.69 (s, 1H). Mass Spectrum: (ΕSI) m/z = 256.01 (258.01) (M+H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
42% | With potassium acetate; In 1,4-dioxane; at 70℃;Inert atmosphere; Sealed tube; | General procedure: A mixture of a (243 mg, 1 mmol), 3-Amino-2-bromopyridine (187, 1.1 mmol), PdCl2(dppf) (51 mg, 0.07 mmol) and KOAc (300 g, 3 mmol) were added in 1,4-dioxane (4 ml). The suspension was bubbled with nitrogen for 20 min, and heated in a sealed tube at 60C for 6 h. The reaction process was similar as Zif-1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). 5.1.2.3.1 2-butylpyridine-4-carboxamide (2c) Following general procedure C, we obtained 2c as a white solid, with an isolated yield of 87%. TLC (CH2Cl2:EtOAc:CH3OH, 70:25:5 v/v): Rf=0.35; 1H NMR (300MHz, CD3OD): δ 8.56 (dd, J=5.3, 0.9Hz, 1H), 7.70 (dd, J=1.8, 0.9Hz, 1H), 7.62 (dd, J=5.3, 1.8Hz, 1H), 2.84 (t, J=7.8Hz, 2H), 1.75-1.65 (m, 2H), 1.43-1.31 (m, 2H), 0.94 (t, J=7.4Hz, 3H); 13C NMR (75MHz, CD3OD): δ 168.6, 163.2, 149.0, 142.3, 120.8, 119.0, 37.2, 31.8, 22.0, 12.9. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
83% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
78% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq) and Pd(PPh3)2Cl2 (0.05 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58% | With 2′-(dicyclohexylphophanyl)-N2,N2,N6,N6-tetramethyl[1,1′-biphenyl]-2,6-diamine; palladium diacetate; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq), Pd(OAc)2 (0.04 eq) and CPhos (0.08 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With 2′-(dicyclohexylphophanyl)-N2,N2,N6,N6-tetramethyl[1,1′-biphenyl]-2,6-diamine; palladium diacetate; In tetrahydrofuran; at 0 - 20℃; for 2.0h;Schlenk technique; Inert atmosphere; | General procedure: A Schlenk tube equipped with a magnetic stir bar and a rubber septum and was heated with a heat gun under vacuum and backfilled with argon 3 times. After cooling at room temperature, 2-bromopyridine-4-carboxamide (1 eq), Pd(OAc)2 (0.04 eq) and CPhos (0.08 eq) were added to the Schlenk tube. The tube was again backfilled with argon 3 times. THF (5mL/mmol) was added to the tube via syringe at room temperature. R-ZnBr solution at 0.5M in THF was added dropwise at 0C and the mixture was stirred 2h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-80:18:2 CH2Cl2:EtOAc:NH3 7N in CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃;Schlenk technique; Inert atmosphere; | General procedure: Negishi cross-coupling reaction. After cooling at room temperature, Pd(PPh3)2Cl2 (0.05 eq) and 2-bromopyridine-4-carboxamide (1 eq) were added to the Schlenk tube at 0C and the mixture was stirred 4h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-70:25:5 CH2Cl2:EtOAc:CH3OH, GraceResolv 24G, over 45min). 5.1.2.2.1 2-ethylpyridine-4-carboxamide (2a) Following general procedure B, we obtained 2a as a yellow solid, with an isolated yield of 73%. TLC (CH2Cl2:EtOAc:CH3OH, 70:25:5 v/v): Rf=0.27; 1H NMR (300MHz, CD3OD): δ 8.58 (dd, J=5.2, 0.9Hz, 1H), 7.73 (dd, J=1.7, 0.9Hz, 1H), 7.65 (dd, J=5.2, 1.7Hz, 1H), 2.88 (q, J=7.6Hz, 2H), 1.31 (t, J=7.6Hz, 3H); 13C NMR (75MHz, CD3OD): δ 168.6, 164.2, 149.0, 142.5, 120.2, 119.1, 30.6, 13.0. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃;Schlenk technique; Inert atmosphere; | General procedure: Negishi cross-coupling reaction. After cooling at room temperature, Pd(PPh3)2Cl2 (0.05 eq) and 2-bromopyridine-4-carboxamide (1 eq) were added to the Schlenk tube at 0C and the mixture was stirred 4h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-70:25:5 CH2Cl2:EtOAc:CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃;Schlenk technique; Inert atmosphere; | General procedure: Negishi cross-coupling reaction. After cooling at room temperature, Pd(PPh3)2Cl2 (0.05 eq) and 2-bromopyridine-4-carboxamide (1 eq) were added to the Schlenk tube at 0C and the mixture was stirred 4h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-70:25:5 CH2Cl2:EtOAc:CH3OH, GraceResolv 24G, over 45min). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With bis-triphenylphosphine-palladium(II) chloride; In tetrahydrofuran; at 0 - 20℃;Schlenk technique; Inert atmosphere; | General procedure: Negishi cross-coupling reaction. After cooling at room temperature, Pd(PPh3)2Cl2 (0.05 eq) and 2-bromopyridine-4-carboxamide (1 eq) were added to the Schlenk tube at 0C and the mixture was stirred 4h at room temperature. The reaction mixture was then quenched by addition of saturated aqueous NH4Cl solution (25ml) and extracted with ethyl acetate (3×25ml). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on silica gel (0-70:25:5 CH2Cl2:EtOAc:CH3OH, GraceResolv 24G, over 45min). |
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