Utilization of Protopine and Related Alkaloids. IV. Transformation of Protopine and Protoberberine Alkaloid to Benzo [c] phenan-thridine Alkaloid
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Anhydroprotopine and anhydromethylberberine were photocyclized to yield 5, 6, 11, 12-tetrahydrobenzo [c] phenanthridine derivatives, which were derived via two steps to sanguinarine and chelerythrine, respectively, in good yield. 5, 6, 11, 12-Tetrahydrobenzo [c]-phenanthridine derivative resulted from the initial photoproduct via rearrangement, which was trapped with dimethyl acetylenedicarboxylate as 4b, 12-etheno-compound.
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社団法人 日本薬学会 | 論文
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