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    • 7. 发明专利
    • PRODUCTION OF SUBSTANCE NF-1616-904
    • JPH0399078A
    • 1991-04-24
    • JP2193790
    • 1990-01-30
    • OTSUKA PHARMA CO LTD
    • KITA YASUYUKIAKAI SHUJIFUJIOKA HIROMICHITAMURA YASUMITSUTONE HITOSHI
    • C07D403/06
    • PURPOSE:To industrially and advantageously obtain the subject compound useful for preventing and treating renal, hepatic insufficiencies, etc., by cyclizing an indole derivative, then protecting oxo group, subsequently methylating the resultant compound and removing protecting groups in the aforementioned methylated derivative. CONSTITUTION:A compound expressed by formula I (R is H, lower alkoxycarbonyl, lower alkanoyl or benzoyl) is cyclized, preferably in the presence of a condensing agent, such as trimethylsilylethoxyacetylene, to provide an indole derivative expressed by formula II, which is then reacted with a compound expressed by formula III (R is lower alkoxycarbonyl, etc.) in an inert solvent to protect the oxo group. The resultant compound is further reacted with diazomethane is the presence of a catalyst, such as boron tribromide, in a solvent, such as methanol, and methylated. The protecting groups in the methylated indole derivative are subsequently removed by hydrolytic and reduction treatment, etc., and the resultant compound is isolated and purified to afford the objective compound expressed by formula IV.