Benzyl chloroformate → HCID 86686196, compound
Reaction equation
[C:1]([Si:5]([O:8][CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([C:16]#[CH:17])[C:11]=1[F:18])([CH3:7])[CH3:6])([CH3:4])([CH3:3])[CH3:2].C([Li])CCC.CCCCCC.Cl[C:31]([O:33][CH2:34][C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)=[O:32].[Cl-].[NH4+]>C1COCC1>[Si:5]([O:8][CH2:9][C:10]1[C:11]([F:18])=[C:12]([C:16]#[C:17][C:31]([O:33][CH2:34][C:35]2[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=2)=[O:32])[CH:13]=[CH:14][CH:15]=1)([C:1]([CH3:4])([CH3:3])[CH3:2])([CH3:7])[CH3:6]Participants
Conditions
- Temperature
- -78 °C
Procedure
tert-Butyl [(3-ethynyl-2-fluorobenzyl)oxy]dimethylsilane (1 g) was mixed with THF (20 ml), and a 1.65 M n-butyl lithium/hexane solution (2.5 ml) was added dropwise thereto at −78° C., followed by stirring at −78° C. for 30 minutes. Benzyl chloroformate (774 mg) was added dropwise thereto at the same temperature, followed by stirring overnight while raising the temperature to room temperature. A saturated aqueous ammonium chloride solution was added thereto at 0° C., followed by extraction with CHCl3. The organic layer was washed with water and saturated brine, and dried over Na2SO4, and the solvent was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (EtOAc/hexane) to obtain benzyl 3-[3-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-fluorophenyl]prop-2-ynoate (1.41 g).
Workup
- customat −78° C.
- stirringby stirring overnight
- temperaturewhile raising the temperature to room temperature
- extractionat 0° C., followed by extraction with CHCl3
- washThe organic layer was washed with water and saturated brine
- dry with materialdried over Na2SO4
- concentrationthe solvent was concentrated under reduced pressure
- customThe obtained residue was purified by silica gel column chromatography (EtOAc/hexane)
Sources & evidence
- ORD record
- ord-90792b922e994aee9a721d5c31e05aa4
- Source dataset
- uspto-grants-2014_05
- Patent number
- US08716470B2
Reaction notes
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