Chemical transformation of protoberberines. III. Convenient synthesis of 8-methoxyberberinephenolbetaine by photooxygenation of berberine. A novel conversion of berberine into (.+-.)-ophiocarpine, (.+-.)-epiophiocarpine, (.+-.)-.ALPHA.-hydrastine, and (.+-.)-.BETA.-hydrastine.
作者:Jerome L. Moniot、el Rahman H. Abd、Abd el Rahman、Maurice Shamma
DOI:10.1016/s0040-4039(01)83354-2
日期:1977.1
Chemical transformation of protoberberines. III. Convenient synthesis of 8-methoxyberberinephenolbetaine by photooxygenation of berberine. A novel conversion of berberine into (.+-.)-ophiocarpine, (.+-.)-epiophiocarpine, (.+-.)-.ALPHA.-hydrastine, and (.+-.)-.BETA.-hydrastine.
作者:MIYOJI HANAOKA、CHISATO MUKAI、YOSHIO ARATA
DOI:10.1248/cpb.31.947
日期:——
Photooxygenation of berberine (5) in methanol in the presence of sodium methoxide and rose bengal afforded the 8, 14-dimethoxy-13-oxoberbine (12), which, on being heated in methanol, readily yielded 8-methoxyberberinephenolbetaine (6), a key intermediate to phthalideisoquinoline alkaloids, (±)-α- and (±)-β-hydrastine (7 and 8). Reduction of 6 with sodium borohydride furnished mostly (±)-ophiocarpine (9) and a little (±)-epiophiocarpine (10).