Structure of 6938-07-4
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CAS No. : | 6938-07-4 |
Formula : | C17H25NO4 |
M.W : | 307.38 |
SMILES Code : | O=C(OCC)CCN(CC1=CC=CC=C1)CCC(OCC)=O |
MDL No. : | MFCD00026918 |
InChI Key : | RWQXNROEHRGDNP-UHFFFAOYSA-N |
Pubchem ID : | 81354 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P280-P301+P312-P302+P352-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 |
---|---|---|
80%; 10% | With aluminum oxide; In neat (no solvent); at 95℃; for 3.0h;Green chemistry; | General procedure: The amine (7.5 mmol) and the Michael acceptor (5 mmol) in a molar ratio of 1.5:1 were refluxedwith stirring in the presence of acidic alumina (1 g, 200 mol%). Heating was performed using an oilbath and the reaction was followed by TLC and GC until completion. The reaction was then allowedto cool down to room temperature and filtered through a filter paper. The catalyst was rinsed withethyl acetate/hexane and then concentrated by rotary evaporation. The crude reaction mixture waspurified using a silica-filled chromatographic column using hexane/ethyl acetate as eluents. Usually,for aliphatic amines, the mono-adduct was eluted using 7:3, 6:4 or 5:5 hexane/ethyl acetate whilstfor aromatic ones the solvent mixture used was 8:2 hexane/ethyl acetate. The yields of the purifiedproducts were recorded and then IR and NMR spectroscopy and MS spectrometry were performed. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
97% | In ethanol; at 20 - 105℃; for 24.5h;Inert atmosphere; | Example 3 Synthesis of β-Alanine, N-(3-ethoxy-3-oxopropyl)-N-(phenylmethyl)-, ethyl ester (N, N-3-diethyl propionate) N, N-di ethyl propionate benzyl amine To a stirred mixture of ethyl acrylate (100 g, 1000 mmol) in ethanol (300 mL) under nitrogen atmosphere, benzyl amine (30 g, 280 mmol) was added drop wise at room temperature over a period of 30 minutes. The reaction mixture was refluxed at 100-105 C. for 24 hours. The excess of ethyl acrylate was removed under reduced pressure to give β-Alanine, N-(3-ethoxy-3-oxopropyl)-N-(phenylmethyl)-, ethyl ester (74 g, 97%) as pale yellow viscous oil. IR (cm-1): 1730, 2825, 2981. 1H NMR (CDCl3): δ 1.13 (6H, t, J=6 Hz), 2.38 (4H, t, J=6 Hz), 2.69 (4H, t, J=5.4), 3.49 (2H, s), 4.0 (4H, q, J=5.4 Hz), 7.1 to 7.2 (5H, Ar) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethanol; | A. To a stirred and refluxing mixture of 403 parts of ethyl 3-[(phenylmethyl)amino]butanoate and 160 parts of ethanol are added dropwise 100 parts of ethyl 2-propenoate. After stirring overnight at reflux temperature, a second portion of 100 parts of ethyl 2-propenoate is added dropwise. Upon completion, stirring is continued at reflux for 48 hours. The reaction mixture is evaporated, yielding a mixture of ethyl N-[2-(ethoxycarbonyl)-1-methylethyl]-N-(phenylmethyl)-β-alanine and ethyl N-[2-(ethoxycarbonyl)ethyl]-N-(phenylmethyl)-β-alanine as an oily residue. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; hydrogen;palladium; In ethanol; | A mixture of 192.8 parts of ethyl N-[2(ethoxycarbonyl)-ethyl]-N-(phenylmethyl)-β-alanine and 280 parts of absolute ethanol is stirred in an hydrogenation vessel. Then there are added 45 parts of hydrochloric acid solution. After cooling, 10 parts of palladium-on-charcoal catalyst 5% are added and the whole is shaken at room temperature while one equivalent of hydrogen is taken up. The catalyst is filtered off and the filtrate is evaporated, yielding ethyl N-[2-(ethoxycarbonyl)ethyl]-β-alanine hydrochloride as an oily residue. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | With palladium 10% on activated carbon; ammonium formate; In ethanol; for 2.0h;Reflux; | Diethyl 3,3'-(benzylazanediyl)dipropanoate (16) was made according to the literature method14 in a yield of 91.2%. 1H NMR (400 MHz, CDCl3) δ 1.23 (t, J = 7.1 Hz, 6H), 2.45 (t, J = 7.1 Hz, 4H), 2.81 (t, J = 7.1 Hz, 4H), 3.60 (s, 2H), 4.10 (q, J = 7.1 Hz, 4H), 7.22-7.29 (m, 5H). MS (APCI+): m/z 308.2 (M+1). Calcd for C17H25NO4: M+ 307.2.A mixture of 16 (4.88 g, 15.9 mmol), HCO2NH4 (10.0 g, 159 mmol) and 10% Pd-C catalyst (2.44 g) in EtOH (ca. 350 mL) was heated at reflux and stirred for 2 h before all the volatiles were removed under reduced pressure. The residue was dissolved in CH2Cl2, filtered through Celite, and evaporated to give diethyl 3,3'-azanediyldipropanoate (17) as a pale yellow liquid (3.30 g, 96%), which had identical 1H NMR characteristics to those reported in the literature.13 MS (APCI+): m/z 218.1 (M+1). Calcd for C10H19NO4: M+ 217.1.Oxalyl chloride (3.92 mL, 46.33 mmol) was added dropwise to a stirred solution of 6-bromohexanoic acid (4.39 g, 22.50 mmol) and DMF (ca. 0.2 mL) in dry CH2Cl2 (50 mL), and the reaction was then stirred overnight. All the volatiles were removed under reduced pressure, and the resulting oil was pumped under high vacuum. The crude 6-bromohexanoyl chloride was dissolved in CH2Cl2 (40 mL) and added portionwise by syringe into a solution of 17 (3.20 g, 14.73 mmol) and NEt3 (10.45 ml, 75.00 mmol) in CH2Cl2 (25 mL). LC-MS was used to monitor the reaction. After 30 mL of the acid chloride solution was added, LC-MS showed most of the diethyl 3,3'-azanediyldipropanoate had reacted. The mixture was stirred for a further 2 h before being washed with aqueous NaHCO3, brine, dried over anhydrous Na2SO4 and filtered. Solvent was removed and the crude product was subjected to flash chromatography (4 × 20 cm silica gel; EtOAc/petroleum ether; 1:3 to 1:1, gradient elution) to give diethyl 3,3'-(6-bromohexanoylazanediyl)dipropanoate (18) as a colorless oil (4.73 g, 81%): 1H NMR (400 MHz, CDCl3) δ 1.24-1.29 (m, 6H), 1.44-1.52 (m, 2H), 1.62-1.70 (m, 2H), 1.85-1.92 (m, 2H), 2.35 (t, J = 7.4 Hz, 2H), 2.55-2.61 (m, 4H), 3.42 (t, J = 6.8 Hz, 2H), 3.58 (t, J = 7.0 Hz, 2H), 3.64 (t, J = 7.3 Hz, 2H), 4.10-4.18 (m, 4H). MS (APCI+): m/z 394.3/396.3 (1:1, M+1). Calcd for C16H2879/81BrNO5: M+ 393.1/395.1.A mixture of 18 (830 mg, 2.11 mmol), dibenzyl 1,4,7,10-tetraazacyclododecane-1,7-dicarboxylate (19)16 (440 mg, 1.00 mmol), and K2CO3 (552 mg, 4.00 mmol) in DMF (10 mL) was stirred at room temperature for 7 h and then at 60 C for 15 h. The mixture was poured into water and extracted with Et2O (×4). The extracts were combined and washed with water, brine, dried over Na2SO4 and filtered. The filtrate was evaporated and the residue obtained was subjected to flash chromatography (silica gel: NEt3/MeOH/CH2Cl2; 0.25:2.5:100 to 0.5:5:100, gradient elution) to give dibenzyl 4,10-bis(6-(bis(3-ethoxy-3-oxopropyl)amino)-6-oxohexyl)-1,4,7,10-tetraazacyclododecane-1,7-dicarboxylate (20) (506 mg, 47%) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 1.23-1.28 (m, 16H), 1.41 (br, 4H), 1.58 (br, 4H), 2.29-2.42 (br, 8H), 2.54-2.65 (m, 16H), 3.42 (br, 8H), 3.55-3.64 (m, 8H), 4.10-4.17 (m, 8H), 5.12 (s, 4H), 7.27-7.35 (m, 10H). MS (APCI+): m/z 1068.0 (M+1). Calcd for C56H86N6O14: M+ 1066.6. Further elution with NEt3/MeOH/CH2Cl2 (1:10:100) gave another colorless oil (202 mg, 27%), which appeared by NMR and MS to be the mono-alkylated product: 1H NMR (400 MHz, CDCl3) δ 1.23-1.60 (m, 16H), 2.25-2.76 (m, 12H), 3.40-3.65 (m, 12H), 4.10-4.16 (m, 4H), 45.12-5.17 (m, 4H), 7.28-7.34 (m, 10H), 11.0 (br, 1H). MS (APCI+): m/z 754.3 (M+1). Calcd for C40H59N5O9: M+ 753.4.A mixture of 20 (155 mg, 0.14 mmol) and 5% Pd-C (80 mg) in EtOH (5 mL) was hydrogenated under 60 psi of hydrogen gas for 15 h. Solvent was removed and the resulting residue was taken up in CH2Cl2 and the catalyst was filtered off. Removal of the solvent gave 1,7-bis(6-(bis(3-ethoxy-3-oxopropyl)amino)-6-oxohexyl)-1,4,7,10-tetraazacyclododecane (21) (100 mg, 86%) as a colorless viscous oil: 1H NMR (400 MHz, CDCl3) δ 1.24-1.36 (m, 16H), 1.45-1.53 (m, 4H), 1.60-1.67 (m, 4H), 2.35 (t, J = 7.4 Hz, 4H), 2.52-2.62 (m, 12H), 2.75 (br, 8H), 2.86 (br, 8H), 3.57 (t, J = 7.0 Hz, 4H), 3.65 (t, J = 7.2 Hz, 4H), 4.10-4.18 (m, 8H). 13C NMR (100 MHz, CDCl3) single peaks at δ 14.01, 24.80, 26.66, 26.75, 32.67, 33.87, 41.99, 44.00, 47.15, 51.31, 56.24, 60.37, 60.74, 170.80, 171.77, 172.77. MS (APCI+): m/z 799.6 (M+1). Calcd for C40H74N6O10: M+ 798.5.A solution of 21 (100 mg, 0.12 mmol) and NaOH (1 mL, 1.0 mol L-1) in EtOH (5 mL) was stirred for 15 h. The mixture was neutralized with HCl (1 mL, 1.0 mol L-1) to pH 5-6. All volatiles were removed and the residue was extracted with EtOH and the solid (NaCl) was filtered off. Removal of solvent gave 3,3',3,3-(6,6'-(1,4,7,10-tetraazacyclododecane-1,7-diyl)bis(hexanoyl)bis(azanediyl))tetrapropanoic acid (H4L11) (90 mg, 100%) as a pale yellow solid: 1H NMR (400 MHz, D2O) δ 1.31-1.35 (m, 4H), 1.59-1.63 (m, 8H), 2.45 (t, J = 7.4 Hz, 4H), 2.61 (t... |
93.4% | With 5%-palladium/activated carbon; hydrogen; In ethanol; under 760.051 Torr; for 20.0h; | Example 4 Synthesis of Diethyl 3, 3'-iminodipropionate The Michael adduct of benzyl amine and ethyl acrylate of Example 3 (10 g, 32.5 mmol) in ethanol (50 mL) and Pd on charcoal (5% Pd/C, 100 mg) was stirred under hydrogen at atmospheric pressure for 20 hours. The catalyst was filtered off and the filtrate was made free of any volatiles by rotary evaporation under reduced pressure at 50 C. to yield diethyl iminodipropionate (6.6 g, 93.4%) as pale yellow viscous liquid. IR (cm-1): 1728, 2838, 2981 and 3330 1H NMR (CDCl3): δ 1.90 (6H, t, J=5.4 Hz), 2.82 (4H, t, J=6 Hz), 2.43 (4H, t, J=4.8 Hz), 4.0 (4H, q, J=5.4 Hz) |
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