Citric Acid → N-methyl-N-{2-[5-(2-oxopropyl)-4,5-dihydro-1,3-thiazol-2-yl]-1H-indol-7-yl}thiophene-2-sulfonamide
Reaction equation
CON(C)[C:4](=[O:30])[CH2:5][CH:6]1[S:10][C:9]([C:11]2[NH:12][C:13]3[C:18]([CH:19]=2)=[CH:17][CH:16]=[CH:15][C:14]=3[N:20]([CH3:29])[S:21]([C:24]2[S:25][CH:26]=[CH:27][CH:28]=2)(=[O:23])=[O:22])=[N:8][CH2:7]1.O1CCC[CH2:33]1.C[Mg]Br.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O1CCCC1>[CH3:29][N:20]([C:14]1[CH:15]=[CH:16][CH:17]=[C:18]2[C:13]=1[NH:12][C:11]([C:9]1[S:10][CH:6]([CH2:5][C:4](=[O:30])[CH3:33])[CH2:7][N:8]=1)=[CH:19]2)[S:21]([C:24]1[S:25][CH:26]=[CH:27][CH:28]=1)(=[O:23])=[O:22]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 10 °C
Procedure
N-Methoxy-N-methyl-2-(2-{7-[methyl(2-thienylsulfonyl)amino]-1H-indol-2-yl}-4,5-dihydro-1,3-thiazol-5-yl)acetamide (0.20 g) was dissolved in absolute tetrahydrofuran (20 mL), and a 12% methylmagnesium bromide tetrahydrofuran solution (1.4 mL) was added under ice-cooling. The mixture was stirred at 10° C. for 5 hr under ice-cooling, acidified with aqueous citric acid solution, and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=35:65-50:50), and the obtained colorless oil was crystallized from ethyl acetate-hexane to give the title compound (121 mg, yield: 67%) as colorless crystals.
Workup
- temperaturecooling
- temperaturecooling
- extractionextracted with ethyl acetate
- washThe organic layer was washed with water and saturated brine
- dry with materialdried over anhydrous magnesium sulfate
- concentrationconcentrated under reduced pressure
- customthe obtained colorless oil was crystallized from ethyl acetate-hexane
Sources & evidence
- ORD record
- ord-776225cb57974bb1ab45fd6957aaadf1
- Source dataset
- uspto-grants-2010_08
- Patent number
- US07777047B2
Reaction notes
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