Methyl iodide → 2-[3-(Tert-butyldimethylsilanyloxy)-4,4,4-trifluoro 1-methylbutyl]pyridine
Reaction equation
[Si:1]([O:8][CH:9]([C:18]([F:21])([F:20])[F:19])[CH2:10][CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][N:13]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[Li+].[CH3:23]C([N-]C(C)C)C.CI>C1COCC1>[Si:1]([O:8][CH:9]([C:18]([F:19])([F:21])[F:20])[CH2:10][CH:11]([C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][N:13]=1)[CH3:23])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- -75 °C
Procedure
A solution of 810 mg (2.54 mmol) of 2-[3-(tert-butyldimethylsilanyloxy)-4,4,4-trifluorobutyl]pyridine in 8 mL of THF was treated with 2.54 mL (3.81 mmol, 1.5 eq.) of LDA (1.5 M solution in cyclohexane) at −75° C. After stirring at −75° C. for 45 minutes, 474 μL (7.61 mmol, 3.0 eq.) of methyl iodide was added at −75° C. The resulting mixture was stirred at this temperature for 10 minutes and quenched with saturated NH4Cl solution. The product was extracted into ether. The ethereal layer was washed with water, brine, dried over magnesium sulfate, filtered, and concentrated in vacuo to give 750 mg (89%) of 2-[3-(tert-butyldimethylsilanyloxy)-4,4,4-trifluoro-1-methylbutyl]pyridine (a mixture of two diastereomers) as a brown oil.
Workup
- stirringThe resulting mixture was stirred at this temperature for 10 minutes
- customquenched with saturated NH4Cl solution
- extractionThe product was extracted into ether
- washThe ethereal layer was washed with water, brine
- dry with materialdried over magnesium sulfate
- filtrationfiltered
- concentrationconcentrated in vacuo
Sources & evidence
- ORD record
- ord-945cd382fd8e43eca03d8b152cf1ebb4
- Source dataset
- uspto-grants-2012_07
- Patent number
- US08212040B2
Reaction notes
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