[C:1]([O:4][CH2:5][C:6]1[O:11][C:10](C)(C)O[C:8](=[O:14])[C:7]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)(=[O:3])[CH3:2].C=[N:22][C:23]([CH3:31])([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[CH3:24]>C1(C)C(C)=CC=CC=1>[C:1]([O:4][CH2:5][C:6]1[O:11][CH2:10][N:22]([C:23]([CH3:31])([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[CH3:24])[C:8](=[O:14])[C:7]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)(=[O:3])[CH3:2]A mixture of 6-acetyloxymethyl-2,2-dimethyl-5-phenyl-2H,4H-1,3-dioxin-4-one (Compound No. 241, 5.0 g) and N-methylene-1-methyl-1-phenylethylamine (2.9 g) was dissolved in xylene (40 ml) and allowed to react by refluxing for 30 minutes. The reaction mixture was purified by silica gel chromatography to afford the captioned compound (yield 72%).
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