[NH2:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[O:8][C:7]([CH3:13])([CH3:12])[CH:6]=[CH:5]2.[CH2:14](O)[CH2:15][CH2:16]O.C(P(CCCC)CCCC)CCC>COCCOC.[Ru](Cl)(Cl)Cl>[CH3:12][C:7]1([CH3:13])[O:8][C:9]2=[CH:10][C:11]3[CH:14]=[CH:15][CH:16]=[N:1][C:2]=3[CH:3]=[C:4]2[CH:5]=[CH:6]1Under nitrogen atmosphere, to a solution of 6-amino-2,2-dimethylchromene (3.88 g, 22.1 mmol) and ruthenium trichloride (55.0 mg, 0.265 mmol) in dimethylene glycol dimethyl ether (8 mL), 1,3-propanediol (0.639 mL, 8.84 mmol) and tri-n-butyl phosphine (0.132 mL, 0.530 mmol) were added at room temperature, and the resulting mixture was stirred at 180° C. for 5 hours. Upon the completion of the reaction, ruthenium complex was removed by florisil column, and solvent was distilled off. The residue was purified by medium pressure column chromatography (hexane/ethyl acetate=5/1) and the aimed product was obtained (yield: 59%).
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