[OH:1][C:2]1[CH:3]=[C:4]([CH:18]=[O:19])[CH:5]=[C:6]2[C:14]=1[C:13](=[CH2:15])[C:12]1([OH:17])[O:16][N:7]2[CH2:8][CH:9]2[CH:11]1[NH:10]2.[H-].[Na+].[CH3:22]I>CN(C)C=O>[OH:17][C:12]12[O:16][N:7]([CH2:8][CH:9]3[CH:11]1[NH:10]3)[C:6]1[C:14](=[C:2]([O:1][CH3:22])[CH:3]=[C:4]([CH:18]=[O:19])[CH:5]=1)[C:13]2=[CH2:15]To a solution of 6,9-dihydroxy-8-methylene-14-oxa-1,11-diazatetracyclo[7.4.1.02,7.010,12 ]tetradeca-2,4,6-triene-4-carbaldehyde (30 mg) in dimethylformamide (1.0 ml) was added a suspension of sodium hydride (60% in oil, 4.6 mg) in dimethylformamide (0.5 ml) in an ice-water bath. To this mixture was added a solution of methyl iodide (7.2 μl) in dimethylformamide (0.1 ml) in an ice-water bath. After stirring for 1 hour in an ice-water bath, the reaction mixture was evaporated to dryness in vacuo, and the residue was subjected to preparative thin layer chromatography, which was developed with a mixture of chloroform and methanol (8:1, v/v) to afford 9-hydroxy-6-methoxy-8-methylene-14-oxa-1,11-diazatetracyclo[7.4.1.02,7.010,12 ]tetradeca-2,4,6-triene-4-carbaldehyde (19 mg).
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