Diisopropylamine → HCID 58566374, compound
Reaction equation
C(NC(C)C)(C)C.C([Li])CCC.[C:13]([C:15]1[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[C:17]([F:23])[CH:16]=1)#[CH:14].Cl[C:25]([O:27][CH2:28][CH3:29])=[O:26]>O1CCCC1>[F:23][C:17]1[CH:16]=[C:15]([C:13]#[C:14][C:25]([O:27][CH2:28][CH3:29])=[O:26])[CH:20]=[CH:19][C:18]=1[O:21][CH3:22]Participants
Procedure
To the mixture of diisopropylamine (0.262 mL, 1.87 mmol) in tetrahydrofuran (5 mL) at −78° C. under nitrogen was added slowly the solution of n-butyllithium (1.17 mL, 1.87 mmol, 1.6M in hexanes). After stirring for 30 minutes, the solution of 4-ethynyl-2-fluoro-1-methoxybenzene (622) (0.180 g, 0.94 mmol) in tetrahydrofuran (1 mL) was added slowly into the reaction mixture. The mixture was allowed to reach 0° C. over 1 hour and ethyl chloroformate (0.134 mL, 1.4 mmol) was added. The resulting mixture was stirred to room temperature for 12 hours, quenched with saturated ammonium chloride and extracted with ethyl ether. The organic phase was washed with water, brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel (5-10% EtOAc in hexanes) to provide ethyl 3-(3-fluoro-4-methoxyphenyl)propiolate (623) (0.070 g, 6.3%) as a colorless oil.
Workup
- waitto reach 0° C. over 1 hour
- stirringThe resulting mixture was stirred to room temperature for 12 hours
- customquenched with saturated ammonium chloride
- extractionextracted with ethyl ether
- washThe organic phase was washed with water, brine
- dry with materialdried over sodium sulfate
- concentrationconcentrated under reduced pressure
- customThe residue was purified by flash chromatography on silica gel (5-10% EtOAc in hexanes)
Sources & evidence
- ORD record
- ord-52546a41c8b34d62b7d21b90c04e1c5f
- Source dataset
- uspto-grants-2013_07
- Patent number
- US08476308B2
Reaction notes
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