[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]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 fritted 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.
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