Hydrochloric Acid → Acetic acid 2-methyl-1-(4-methylthiophenyl)propan-1-on-2-yl ester
Reaction equation
[OH:1][C:2]([CH3:14])([CH3:13])[C:3]([C:5]1[CH:10]=[CH:9][C:8]([S:11][CH3:12])=[CH:7][CH:6]=1)=[O:4].C1CCN2C(=NCCC2)CC1.[C:26](Cl)(=[O:28])[CH3:27].Cl>CN(C1C=CN=CC=1)C.ClCCl>[CH3:13][C:2]([O:1][C:26](=[O:28])[CH3:27])([CH3:14])[C:3]([C:5]1[CH:10]=[CH:9][C:8]([S:11][CH3:12])=[CH:7][CH:6]=1)=[O:4]Participants
7
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 25 °C
Procedure
To a 0° C. solution of 2-hydroxy-2-methyl-1-(4-(methylthio) phenyl)propan-1-one (150 g, example 1, Step 2), DBU (217 g) and DMAP (7 g) in dichloromethane (850 mL) was added acetyl chloride (112.2 g) dropwise and the mixture was stirred for 6 h. at 25° C. More DBU (32.5 g) was added and the mixture was stirred an additionnal 16 h. The reaction mixture was poured over 2N HCl (800 mL) and the organic layer was separated, washed with a saturated solution of NaHCO3, dried over MgSO4, filtered and the solvent was evaporated under vacuum. The residue was swished in Et2O, then 25% ethyl acetate in hexane, then filtered and dried giving 74 g of the title compound.
Workup
- stirringthe mixture was stirred an additionnal 16 h
- customthe organic layer was separated
- washwashed with a saturated solution of NaHCO3
- dry with materialdried over MgSO4
- filtrationfiltered
- customthe solvent was evaporated under vacuum
- filtration25% ethyl acetate in hexane, then filtered
- customdried
Sources & evidence
- ORD record
- ord-c83139f67dab45f3b5934b76a1958fc9
- Source dataset
- uspto-grants-1998_08
- Patent number
- US05789413
Reaction notes
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