No renderable structure data available
C1CCC(=O)N(CC1)CC2=CC=CC=C2Chemical Intermediate
Structures, identifiers and computed properties have been matched to the database record by CAS.
| Intermediates | 1-benzylazepan-2-one |
|---|---|
| IUPAC Name | — |
| CAS Number | 33241-96-2 |
| Database ID | 1491068 |
| Molecular Formula | — |
| Molecular Weight | — |
Product Information
1-benzylazepan-2-one (CAS 33241-96-2) product identity, structure identifiers and related reaction data for chemical intermediate research and sourcing review.
Potential Applications
For professional research and industrial use only
Database ID 1491068
Safety Notice
For professional research and industrial use only. Review the supplier safety data sheet before handling.
Synthesis data
12 reactions · 12 references
Conditions: temp:0.00; pressure:0.00; stir:
Source ID: ord-637c61d6846e4f5c8f135b7364ec892dConditions: temp:0.00; pressure:0.00; stir:
Source ID: ord-d55f0d68c28d464ebf0718d2115b575aConditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: LDA was prepared as follows: Diisopropyl amine (15.2 mL, 110 mmol) freshly distilled under N2 and over CaH2 was added to 110 mL of anhydrous THF in a dry flask, and the solution was cooled to 0° C. in an ice bath. nBuLi (73.3 mL, 111 mmol) was added dropwise, and the reaction was stirred at 0° C. for 1 hour. The freshly prepared LDA was added dropwise to a −70° C. solution of 1-Benzyl-azepan-2-one (142) (10.98 g, 544.0 mmol) dissolved in anhydrous Et2O (70 mL). The reaction was stirred at −70° C. for 1 hour, then dimethyl carbonate (4.55 mL, 544 mmol) was added dropwise. The reaction was allowed to warm to room temperature overnight. The reaction was judged complete by HPLC, and was slowly poured into 5N HCl stirring in an ice bath. The organic layer was extracted. The aqueous layer was washed with CH2Cl2 two times, and the combined organics were dried with sodium sulfate, filtered and concentrated in vacuo. Crude material was purified on an automated flash column with 80:20 Hexanes:EtOAc to obtain 10.85 g, (77%) of 1-benzyl-2-oxo-azepane-3-carboxylic acid methyl ester (143) as a pale yellow oil. 1H NMR (CDCl3) 7.42-7.10 (5H, broad s), 4.61 (1H, d, J=14.7 Hz), 4.50 (1H, d, J=14.7 Hz), 3.74 (3H, s), 3.7-3.64 (1H, m), 3.40-3.13 (2H, m), 2.12-1.98 (1H, m), 1.92-1.73 (2H, m), 1.66-1.42 (2H, m), 1.32-1.16 (1H, m) ppm. 13C NMR (CDCl3, 75 MHz) 171.94, 171.04, 137.28, 128.55, 128.24, 127.43, 52.15 (2), 51.27, 48.31, 27.87, 27.41, 25.91 ppm. LRMS: 261.73. The reaction was stirred at −70° C. for 1 hour to warm to room temperature overnight The organic layer was extracted The aqueous layer was washed with CH2Cl2 two times the combined organics were dried with sodium sulfate filtered concentrated in vacuo Crude material was purified on an automated flash column with 80:20 Hexanes
Source ID: ord-c94a3caa897447cc8cc810af2175976cConditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a stirring 0° C. suspension of NaH (18.3 g, 763 mmol) in THF (195 mL) was added by addition funnel azepan-2-one (75.0 g, 667 mmol) in THF. An additional 2 L of solvent was added as the reaction progressed in order to maintain agitation of the very viscous reaction suspension. Following addition, the reaction was allowed to warm to room temperature, and when the evolution of H2 ceased after stirring overnight, benzyl bromide was added dropwise by addition funnel and the reaction was stirred overnight. The crude product was filtered through Celite and concentrated in vacuo. Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid. 1H NMR (CDCl3) 7.38-7.24 (5H, m), 4.61 (2H, s), 3.33-3.29 (2H, m), 2.65-2.61 (2H, m), 1.77-1.66 (4H, m), 1.56-1.46 (2H, m) ppm. 13C NMR (CDCl3, 75 MHz) 176.13, 138.06, 128.67, 128.31, 127.43, 51.20, 49.04, 37.33, 30.12, 28.26, 23.58 ppm. to maintain agitation of the very viscous reaction suspension addition the reaction was stirred overnight The crude product was filtered through Celite concentrated in vacuo Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid
Source ID: ord-3b86390c531f4465a28de735ef760cf5Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a stirring 0° C. suspension of NaH (18.3 g, 763 mmol) in THF (195 mL) was added by addition funnel azepan-2-one (75.0 g, 667 mmol) in THF. An additional 2 L of solvent was added as the reaction progressed in order to maintain agitation of the very viscous reaction suspension. Following addition, the reaction was allowed to warm to room temperature, and when the evolution of H2 ceased after stirring overnight, benzyl bromide was added dropwise by addition funnel and the reaction was stirred overnight. The crude product was filtered through Celite and concentrated in vacuo. Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid. 1H NMR (CDCl3) 7.38-7.24 (5H, m), 4.61 (2H, s), 3.33-3.29 (2H, m), 2.65-2.61 (2H, m), 1.77-1.66 (4H, m), 1.56-1.46 (2H, m) ppm. 13C NMR (CDCl3, 75 MHz) 176.13, 138.06, 128.67, 128.31, 127.43, 51.20, 49.04, 37.33, 30.12, 28.26, 23.58 ppm. to maintain agitation of the very viscous reaction suspension addition the reaction was stirred overnight The crude product was filtered through Celite concentrated in vacuo Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid
Source ID: ord-3b86390c531f4465a28de735ef760cf5Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: 1-Benzylhexahydro-2H-azepin-2-one (10.2 g) in tetrahydrofuran (100 ml) was added dropwise to a stirred, cooled solution of lithium-2,2,6,6-tetramethylpiperidide [prepared by the addition of 2,2,6,6-tetramethylpiperidine (8.5 g) to butyl lithium (0.05 mole) in hexane (32 ml)] under nitrogen. When the addition was completed a further portion of butyl lithium (0.05 mole) in hexane (32 ml) was added. The solution was cooled to 0° C. and o-chloroanisole (6.2 ml) added dropwise. After stirring at room temperature for four hours the reaction was decomposed with water and the solvents removed under reduced pressure. The resulting oil was partitioned between 5 M hydrochloric acid and toluene. After drying (MgSO4) the toluene was removed to leave an oil which was distilled affording 5.02 g b.p. 180°-220° C. at 0.2 mm. The oil was crystallised from methanol, affording 3.15 g m.p. 120°-122° C. When the addition was added the solvents removed under reduced pressure The resulting oil was partitioned between 5 M hydrochloric acid and toluene After drying (MgSO4) the toluene was removed to leave an oil which was distilled affording 5.02 g b.p. 180°-220° C. at 0.2 mm The oil was crystallised from methanol affording 3.15 g m.p. 120°-122° C.
Source ID: ord-1431711e01d04526923d1330c5bbef03Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: 1-Benzylhexahydro-2H-azepin-2-one (10.2 g) in tetrahydrofuran (100 ml) was added dropwise to a stirred, cooled solution of lithium-2,2,6,6-tetramethylpiperidide [prepared by the addition of 2,2,6,6-tetramethylpiperidine (8.5 g) to butyl lithium (0.05 mole) in hexane (32 ml)] under nitrogen. When the addition was completed a further portion of butyl lithium (0.05 mole) in hexane (32 ml) was added. The solution was cooled to 0° C. and o-chloroanisole (6.2 ml) added dropwise. After stirring at room temperature for four hours the reaction was decomposed with water and the solvents removed under reduced pressure. The resulting oil was partitioned between 5 M hydrochloric acid and toluene. After drying (MgSO4) the toluene was removed to leave an oil which was distilled affording 5.02 g b.p. 180°-220° C. at 0.2 mm. The oil was crystallised from methanol, affording 3.15 g m.p. 120°-122° C. When the addition was added the solvents removed under reduced pressure The resulting oil was partitioned between 5 M hydrochloric acid and toluene After drying (MgSO4) the toluene was removed to leave an oil which was distilled affording 5.02 g b.p. 180°-220° C. at 0.2 mm The oil was crystallised from methanol affording 3.15 g m.p. 120°-122° C.
Source ID: ord-1431711e01d04526923d1330c5bbef03Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: LDA was prepared as follows: Diisopropyl amine (15.2 mL, 110 mmol) freshly distilled under N2 and over CaH2 was added to 110 mL of anhydrous THF in a dry flask, and the solution was cooled to 0° C. in an ice bath. nBuLi (73.3 mL, 111 mmol) was added dropwise, and the reaction was stirred at 0° C. for 1 hour. The freshly prepared LDA was added dropwise to a −70° C. solution of 1-benzyl-azepan-2-one (10.98 g, 544.0 mmol) dissolved in anhydrous Et2O (70 mL). The reaction was stirred at −70° C. for 1 hour, then dimethyl carbonate (4.55 mL, 544 mmol) was added dropwise. The reaction was allowed to warm to room temperature overnight. The reaction was judged complete by HPLC, and was slowly poured into 5N HCl stirring in an ice bath. The organic layer was extracted. The aqueous layer was washed with CH2Cl2 two times, and the combined organics were dried with Na2SO4 and concentrated in vacuo. Crude material was purified on an automated flash column with 80:20 Hexanes:EtOAc to obtain 10.85 g, (77%) of 1-benzyl-2-oxo-azepane-3-carboxylic acid methyl ester as a pale yellow oil. 1H NMR (CDCl3, 300 MHz) 7.42–7.10 (5H, broad s), 4.61 (1H, d, J=14.7 Hz), 4.50 (1H, d, J=14.7 Hz), 3.74 (3H, s), 3.7–3.64 (1H, m), 3.40–3.13 (2H, m), 2.12–1.98 (1H, m), 1.92–1.73 (2H, m), 1.66–1.42 (2H, m), 1.32–1.16 (1H, m) ppm. 13C NMR (CDCl3, 75 MHz) 171.94, 171.04, 137.28, 128.55, 128.24, 127.43, 52.15 (2), 51.27, 48.31, 27.87, 27.41, 25.91 ppm. LRMS: 261.73. The reaction was stirred at −70° C. for 1 hour to warm to room temperature overnight The organic layer was extracted The aqueous layer was washed with CH2Cl2 two times the combined organics were dried with Na2SO4 concentrated in vacuo Crude material was purified on an automated flash column with 80:20 Hexanes
Source ID: ord-677802025be4429095fdfbe07d38fd47Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a stirring 0° C. suspension of NaH (18.3 g, 763 mmol) in THF (195 mL) was added by addition funnel azepan-2-one (75.0 g, 667 mmol) in THF. An additional 2L of solvent was added as the reaction progressed in order to maintain agitation of the very viscous reaction suspension. Following addition, the reaction was allowed to warm to room temperature, and when the evolution of H2 gas ceased after stirring overnight, benzyl bromide was added dropwise by addition funnel and the reaction was stirred overnight. The crude product was filtered through Celite and concentrated in vacuo. Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one as a white fluffy solid. 1H NMR (CDCl3, 300 MHz) 7.38–7.24 (5H, m), 4.61 (2H, s), 3.33–3.29 (2H, m), 2.65–2.61 (2H, m), 1.77–1.66 (4H, m), 1.56–1.46 (2H, m) ppm. 13C NMR (CDCl3, 75 MHz) 176.13, 138.06, 128.67, 128.31, 127.43, 51.20, 49.04, 37.33, 30.12, 28.26, 23.58 ppm. to maintain agitation of the very viscous reaction suspension addition the reaction was stirred overnight The crude product was filtered through Celite concentrated in vacuo Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one as a white fluffy solid
Source ID: ord-903e3c782fd54137b31c81fd0b5a711aConditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a stirring 0° C. suspension of NaH (18.3 g, 763 mmol) in THF (195 mL) was added by addition funnel azepan-2-one (75.0 g, 667 mmol) in THF. An additional 2L of solvent was added as the reaction progressed in order to maintain agitation of the very viscous reaction suspension. Following addition, the reaction was allowed to warm to room temperature, and when the evolution of H2 gas ceased after stirring overnight, benzyl bromide was added dropwise by addition funnel and the reaction was stirred overnight. The crude product was filtered through Celite and concentrated in vacuo. Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one as a white fluffy solid. 1H NMR (CDCl3, 300 MHz) 7.38–7.24 (5H, m), 4.61 (2H, s), 3.33–3.29 (2H, m), 2.65–2.61 (2H, m), 1.77–1.66 (4H, m), 1.56–1.46 (2H, m) ppm. 13C NMR (CDCl3, 75 MHz) 176.13, 138.06, 128.67, 128.31, 127.43, 51.20, 49.04, 37.33, 30.12, 28.26, 23.58 ppm. to maintain agitation of the very viscous reaction suspension addition the reaction was stirred overnight The crude product was filtered through Celite concentrated in vacuo Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one as a white fluffy solid
Source ID: ord-903e3c782fd54137b31c81fd0b5a711aConditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: LDA was prepared as follows: Diisopropyl amine (15.2 mL, 110 mmol) freshly distilled under N2 and over CaH2 was added to 110 mL of anhydrous THF in a dry flask, and the solution was cooled to 0° C. in an ice bath. nBuLi (73.3 mL, 111 mmol) was added dropwise, and the reaction was stirred at 0° C. for 1 hour. The freshly prepared LDA was added dropwise to a −70° C. solution of 1-Benzyl-azepan-2-one (142) (10.98 g, 544.0 mmol) dissolved in anhydrous Et2O (70 mL). The reaction was stirred at −70° C. for 1 hour, then dimethyl carbonate (4.55 mL, 544 mmol) was added dropwise. The reaction was allowed to warm to room temperature overnight. The reaction was judged complete by HPLC, and was slowly poured into 5N HCl stirring in an ice bath. The organic layer was extracted. The aqueous layer was washed with CH2Cl2 two times, and the combined organics were dried with sodium sulfate, filtered and concentrated in vacuo. Crude material was purified on an automated flash column with 80:20 Hexanes:EtOAc to obtain 10.85 g, (77%) of 1-benzyl-2-oxo-azepane-3-carboxylic acid methyl ester (143) as a pale yellow oil. 1H NMR (CDCl3) 7.42-7.10 (5H, broad s), 4.61 (1H, d, J=14.7 Hz), 4.50 (1H, d, J=14.7 Hz), 3.74 (3H, s), 3.7-3.64 (1H, m), 3.40-3.13 (2H, m), 2.12-1.98 (1H, m), 1.92-1.73 (2H, m), 1.66-1.42 (2H, m), 1.32-1.16 (1H, m) ppm. 13C NMR (CDCl3, 75 MHz) 171.94, 171.04, 137.28, 128.55, 128.24, 127.43, 52.15 (2), 51.27, 48.31, 27.87, 27.41, 25.91 ppm. LRMS: 261.73. The reaction was stirred at −70° C. for 1 hour to warm to room temperature overnight The organic layer was extracted The aqueous layer was washed with CH2Cl2 two times the combined organics were dried with sodium sulfate filtered concentrated in vacuo Crude material was purified on an automated flash column with 80:20 Hexanes
Source ID: ord-1b7c1223bb314ae591dc3a48058c03aaConditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
Procedure: To a stirring 0° C. suspension of NaH (18.3 g, 763 mmol) in THF (195 mL) was added by addition funnel azepan-2-one (75.0 g, 667 mmol) in THF. An additional 2 L of solvent was added as the reaction progressed in order to maintain agitation of the very viscous reaction suspension. Following addition, the reaction was allowed to warm to room temperature, and when the evolution of H2 ceased after stirring overnight, benzyl bromide was added dropwise by addition funnel and the reaction was stirred overnight. The crude product was filtered through Celite and concentrated in vacuo. Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid. 1H NMR (CDCl3) 7.38-7.24 (5H, m), 4.61 (2H, s), 3.33-3.29 (2H, m), 2.65-2.61 (2H, m), 1.77-1.66 (4H, m), 1.56-1.46 (2H, m) ppm. 13C NMR (CDCl3, 75 MHz) 176.13, 138.06, 128.67, 128.31, 127.43, 51.20, 49.04, 37.33, 30.12, 28.26, 23.58 ppm. to maintain agitation of the very viscous reaction suspension addition the reaction was stirred overnight The crude product was filtered through Celite concentrated in vacuo Recrystallization from hexanes and ethyl acetate provided pure 1-benzyl-azepan-2-one (142) as a white fluffy solid
Source ID: ord-63be0cc19f824a7b8471c2b40563d3d8PubChem References
These sources are listed in the compound's public database record.
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