Toluene → Prop-2-ynyl-(2,2,3,3-tetrafluoro-2,3-dihydro-benzo[1,4]dioxin-6-yl)-amine
Reaction equation
[F:1][C:2]1([F:15])[O:7][C:6]2[CH:8]=[CH:9][C:10]([NH2:12])=[CH:11][C:5]=2[O:4][C:3]1([F:14])[F:13].C(=O)([O-])[O-].[K+].[K+].[CH2:22](Br)[C:23]#[CH:24].C1(C)C=CC=CC=1>C(#N)C>[CH2:24]([NH:12][C:10]1[CH:9]=[CH:8][C:6]2[O:7][C:2]([F:1])([F:15])[C:3]([F:13])([F:14])[O:4][C:5]=2[CH:11]=1)[C:23]#[CH:22]Participants
Conditions
- Temperature
- 67.5 °C
Procedure
Another method to prepare the titled compound is as follows. 2,2,3,3-Tetrafluoro-6-aminobenzodioxane (50.2 g, 225 mmol) and potassium carbonate (43.54 g, 315 mmol) were suspended into acetonitrile (250 mL), stirred in a 1-liter three-necked flask equipped with an overhead mechanical stirrer, and treated with ˜80% propargyl bromide in toluene (33.5 g, ˜225 mmol). The mixture was slowly heated to 65-70° C. over about three hours. Stirring was continued at that temperature for 24 hours, at which time the heat was turned off and the mixture was permitted to cool to room temperature. The mixture was filtered through a glass flitted funnel, and the solids were rinsed with acetonitrile (300 mL). The filtrate was concentrated, reconcentrated thrice from hexanes, and chromatographed on silica (0 to 1 to 2 to 4% EtOAc/hexanes) to give the titled compound.
Workup
- customequipped with an overhead mechanical stirrer
- stirringStirring
- temperatureto cool to room temperature
- filtrationThe mixture was filtered through a glass
- washthe solids were rinsed with acetonitrile (300 mL)
- concentrationThe filtrate was concentrated
- customchromatographed on silica (0 to 1 to 2 to 4% EtOAc/hexanes)
Sources & evidence
- ORD record
- ord-4b72f88494954484ae710315d9f9db9f
- Source dataset
- uspto-grants-2013_06
- Patent number
- US08470813B2
Reaction notes
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