Propargyl bromide → 1-(Prop-2-yn-1-yl)piperidin-2-one
Reaction equation
[H-].[Na+].[NH:3]1[CH2:8][CH2:7][CH2:6][CH2:5][C:4]1=[O:9].[CH2:10](Br)[C:11]#[CH:12]>CCCCCC.C1(C)C=CC=CC=1>[CH2:12]([N:3]1[CH2:8][CH2:7][CH2:6][CH2:5][C:4]1=[O:9])[C:11]#[CH:10]Participants
6
Reactant 3
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 15 °C
Procedure
Sodium hydride (5.76 g of 50% dispersion in oil, 0.12 mole) was washed three times with hexane and suspended in 645 ml of toluene. 2-Piperidone (11.88 g, 0.12 mole) in 100 ml of toluene was added to the well stirred sodium hydride suspension and heated to reflux for 2 hours. The reaction mixture was cooled to 15° C. and 2-propynyl bromide (14.28 g, 0.12 mole) in 55 ml of toluene added over 30 minutes. The mixture was then stirred at room temperature for 19 hours, filtered and mother liquor evaporated to yield a first batch of 1-(2-propynyl)-2-piperidone as an oil (7.87 g of about 55% purity by pnmr assay).
Workup
- temperatureheated
- temperatureto reflux for 2 hours
- filtrationfiltered
- custommother liquor evaporated
Sources & evidence
- ORD record
- ord-726cb4ef409146f78ac888a463909895
- Source dataset
- uspto-grants-1984_02
- Patent number
- US04431646
Reaction notes
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