Photochemical valence tautomerization of berberinephenolbetaines to 8,14-cycloberbines,versatile aziridine derivatives for spirobenzylisoquinolines |
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Authors: | Miyoji Hanaoka Shingo Yasuda Kazuyoshi Nagami Keiko Okajima Takeshi Imanishi |
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Institution: | Faculty of Pharmaceutical Sciences, Kanazawa University Tekara-machi, Kanazawa, 920, Japan |
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Abstract: | Irradiation of the berberinephenolbetaines (, , and ) effected valence tautomerization to give the 8,14-cycloberbines (, , and ), the aziridine derivatives, in high yield. The 8,14-cycloberbines were efficiently converted to the spirobenzylisoquinolines by regioselective C bond cleavage. |
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