A new strategy for the synthesis of pentacyclic Strychnos alkaloids: synthesis of (±)-tubifolidine

Abstract
The hexahydro-1,5-methanoazocino[4,3-b]indole (2a) was converted into (±)-tubifolidine (6a)via a four-step synthetic sequence which involves cyclization of a thionium ion upon the 3-position of a 2,3-disubstituted indole as the crucial step.

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