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A convenient synthesis of conformationally restricted sulfonamides such as compounds (12) and (40) with seven- and eight-membered ring structures has been achieved using radical reaction. These compounds and their analogs are expected to serve as important pharmacophores in drug discovery.
Erythrina alkaloids represented by structure (1) are known to possess potent CNS activities. In this article, we have completed the synthesis of modified heterocyclic core structures (4) of erythrina alkaloids incorporating groups, which are expected to be metabolically more stable. Finally, we have oxidatively rearranged (4) to yield novel heterocycles (5).
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