A total synthesis of (±)-α-cyclopiazonic acid using a cationic cascade
Literature Information
Charlotte M. Haskins, David W. Knight
The indolic terpene alkaloid α-cyclopiazonic acid 1 has been prepared in 11 steps from indole-4-methanol 6; the key step is a carbocationic cascade, terminated by a 4-nitrosulfonamide group and initiated by benzylic carbocation formation directly from the intermediate 9, which gives the tetracyclic product 10 in 74% yield.
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