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Stemona alkaloids 1¨C3 have been the targets of successful synthetic campaigns by this (24¨C26) and other groups (2737),although the synthesis of neotuberostemonine 4 has yet to be realized.Our own interest in this class of natural products was driven initially by the challenges presented by these alkaloids in such a total synthesis context. To that end, we carried out a first-generation
formal synthesis of stenine (26). In the course of this work,we discovered that it was possible to streamline the synthesis by combining two Lewis acid-promoted reactions, a Diels¨CAlder and an intramolecular Schmidt reaction, into a tandem reaction sequence (Scheme 1). Realizing the general value of this process for heterocyclic synthesis, this methodology was further developed into a general intermolecular variant (38) that was in turn reapplied to the problem of Stemona alkaloid synthesis. This methodology enabled efficient and practical total syntheses of both stenine (25) and neostenine (24) that yielded ample quantities for biological study (9 and 13 steps from commercially available starting materials, respectively). This Diels¨CAlder/Schmidt reaction sequence also provided straightforward access to Stemona alkaloid-like scaffolds for the parallel synthesis of a diverse compound collection (39).
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