Aspirin → 3-(Benzyloxycarbonylamino)propyl 2-acetoxybenzoate
Reaction equation
[C:1]([O:4][C:5]1[CH:13]=[CH:12][CH:11]=[CH:10][C:6]=1[C:7]([OH:9])=[O:8])(=[O:3])[CH3:2].C(N(CC)CC)C.ClC(OCC)=O.O[CH2:28][CH2:29][CH2:30][NH:31][C:32](=[O:41])[O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1>C(Cl)Cl>[C:1]([O:4][C:5]1[CH:13]=[CH:12][CH:11]=[CH:10][C:6]=1[C:7]([O:9][CH2:28][CH2:29][CH2:30][NH:31][C:32]([O:33][CH2:34][C:35]1[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=1)=[O:41])=[O:8])(=[O:3])[CH3:2]Participants
Conditions
- Temperature
- 0 °C
Procedure
To a solution of 2-acetoxybenzoic acid (2.0 g, 11.1 mmol) and triethylamine (1.8 mL, 11.1 mmol) in CH2Cl2 (40 mL) at 0° C. was slowly added ClCO2Et (1.1 mL, 167 mmol). The reaction mixture was stirred (0° C., 2 h) and filtered. The filtrate was added to a solution of benzyl 3-hydroxypropylcarbamate (2.1 g, 10.0 mmol) and triethylamine (15 mL) in CH2Cl2 (40 mL). The reaction mixture was stirred (RT, 4 h) and quenched with H2O (50 mL). The organic layer was washed with 1M HCl, saturated Na2CO3 (30 mL) and H2O (50 mL). The organic solution was dried over MgSO4 and concentrated under reduced pressure. The residue was purified by silica chromatography, (PE-EtOAc, 5:1) to afford 3-(benzyloxycarbonylamino)propyl 2-acetoxybenzoate (2.0 g, 54%) as a colorless oil. Mass calculated for C20H21NO64=371.38; found: [M+H]+=372.3.
Workup
- customat 0° C.
- filtrationfiltered
- stirringThe reaction mixture was stirred (RT, 4 h)
- customquenched with H2O (50 mL)
- washThe organic layer was washed with 1M HCl, saturated Na2CO3 (30 mL) and H2O (50 mL)
- dry with materialThe organic solution was dried over MgSO4
- concentrationconcentrated under reduced pressure
- customThe residue was purified by silica chromatography, (PE-EtOAc, 5:1)
Sources & evidence
- ORD record
- ord-5ee949f9cc074fd791f8be8b26ac66dc
- Source dataset
- uspto-grants-2012_05
- Patent number
- US08173831B2
Reaction notes
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