Abstract
Mattogrossine is an indole alkaloid isolated from Strychnos mattogrossensis that contains an unusual tetrahydrofuran ring with a concomitant hemiacetal in its structure. While tetrahydrofuran intermediates have been used in the synthesis of other strychnos alkaloids, no investigations have been performed into the synthesis of alkaloids containing this structure. We have developed an oxocarbenium-ion-initiated cascade annulation that provides us access to the ABCD ring structure of mattogrossine.
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