[CH:1]1[CH2:6][CH2:5][CH:4]([CH:7]2[CH2:16][C:15](=[O:17])[C:10]([C:11]([O:13][CH3:14])=[O:12])=[CH:9][N:8]2[C:18]2[CH:23]=[CH:22][C:21]([OH:24])=[CH:20][CH:19]=2)[CH2:3][CH:2]=1.ClC1C(=O)C(Cl)=C(Cl)C(=O)C=1Cl>O1CCOCC1>[CH:1]1[CH2:6][CH2:5][CH:4]([C:7]2[N:8]([C:18]3[CH:23]=[CH:22][C:21]([OH:24])=[CH:20][CH:19]=3)[CH:9]=[C:10]([C:15](=[O:17])[CH:16]=2)[C:11]([O:13][CH3:14])=[O:12])[CH2:3][CH:2]=1In 20 ml of dioxane was dissolved 1.0 g of methyl 6-(cyclohexen-4-yl)-1-(4-hydroxyphenyl)-4-oxo-1,4,5,6-tetrahydronicotinate, and the resulting solution was heated to 80° C. To this solution was added dropwise a solution of 0.83 g of 2,3,5,6-tetrachloro-p-benzoquinone in 20 ml of dioxane at 80° C., followed by reaction at the same temperature for 1 hour. After completion of this reaction, the reaction mixture was cooled to room temperature, and the precipitated crystals were collected by filtration and washed with 50 ml of dioxane to obtain 0.7 g of methyl 6-(cyclohexene-4-yl)-1-(4-hydroxyphenyl)-4-oxo-1,4-dihydronicotinate having a melting point of 250° C. or more.
불러오는 중…
