Cesium carbonate → 6'-(3-Chloropyridin-2-yl)aminodispiro[1,3-oxazole-4,4'-chromene-3',3''-oxetane]-2-amine

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The mixture of di-tert-butyl (6′-bromodispiro[1,3-oxazole-4,4′-chromene-3′,3″-oxetan]-2-yl)imidodicarbonate (150 mg, 0.286 mmol), 3-chloropyridin-2-amine (184 mg, 1.43 mmol), (1E,4E)-1,5-diphenylpenta-1,4-dien-3-one-palladium (3:2) (52 mg, 0.057 mmol), di-tert-butyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine (97 mg, 0.23 mmol), and Cs2CO3(279 mg, 0.857 mmol) in 1,4-dioxane (7.5 ml) was stirred for 48 hours at 100° C. The reaction mixture was cooled down to ambient temperature, and partitioned with CHCl3 and water. The organic layer was dried over Na2SO4, and filtered. The residue was dissolved in toluene, and was added silica gel (neutral), and stirred at 130° C. for 3 hours. The mixture was concentrated under reduced pressure, and purified by silica gel column chromatography (CHCl3/MeOH=100:0-85:15) to give an amorphous, which was washed with CHCl3/hexane to give 6′-(3-chloropyridin-2-yl)aminodispiro[1,3-oxazole-4,4′-chromene-3′,3″-oxetane]-2-amine (28 mg).

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