Dimethyl Sulfoxide → 5-Acetylamino-2-formyl-2,4,6,7-tetramethyl-2,3-dihydrobenzofuran
Reaction equation
C(Cl)(=O)C(Cl)=O.CS(C)=O.[C:11]([NH:14][C:15]1[C:16]([CH3:29])=[C:17]([CH3:28])[C:18]2[O:22][C:21]([CH2:24][OH:25])([CH3:23])[CH2:20][C:19]=2[C:26]=1[CH3:27])(=[O:13])[CH3:12].C(N(CC)CC)C>ClCCl>[C:11]([NH:14][C:15]1[C:16]([CH3:29])=[C:17]([CH3:28])[C:18]2[O:22][C:21]([CH:24]=[O:25])([CH3:23])[CH2:20][C:19]=2[C:26]=1[CH3:27])(=[O:13])[CH3:12]Participants
Procedure
A solution of oxalyl chloride (0.45 ml, 4.7 mmol) in dichloromethane (10 ml) was cooled to -78° C. and dimethyl sulfoxide (1 ml) was added dropwise with stirring. After stirring at the same temperature for 2 hours, a solution of 5-acetylamino-2-hydroxymethyl-2,4,6,7-tetramethyl-2,3-dihydrobenzofuran (1.1 g, 4.2 mmol) in dichloromethane (5 ml) was added dropwise and the mixture was stirred for additional 30 minutes. Triethylamine (3.5 ml) was added and the mixture was stirred for 10 minutes. The reaction mixture was washed with 1N hydrochloric acid and aqueous saturated sodium bicarbonate solution. The reaction mixture was dried and then concentrated. The residue was purified by column chromatography on silica gel (ethyl acetate) to obtain the desired compound (0.47 g, yield: 43.1%) as oil.
Workup
- stirringAfter stirring at the same temperature for 2 hours
- stirringthe mixture was stirred for additional 30 minutes
- stirringthe mixture was stirred for 10 minutes
- washThe reaction mixture was washed with 1N hydrochloric acid and aqueous saturated sodium bicarbonate solution
- customThe reaction mixture was dried
- concentrationconcentrated
- customThe residue was purified by column chromatography on silica gel (ethyl acetate)
Sources & evidence
- ORD record
- ord-55991ef8afe94082a31f82d7ec03bc2a
- Source dataset
- uspto-grants-1994_12
- Patent number
- US05376681
Reaction notes
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