Abstract
AbstractMacroline-type monoterpenoid indole alkaloids represent a fascinating class of natural products with polycyclic structures, diverse biological and pharmacological activities. Herein the asymmetric total syntheses of two of this type alkaloids, (–)-Alstomicine and (–)-Alstofolinine A are reported. Notably, these two alkaloids are divergently synthesized from a common indole-fused azabicyclo[3.3.1]nonane intermediate, which was easily obtained via a Mannich-type cyclization. An SmI2-mediated Reformatsky reaction and a Pd-catalyzed carbonylative lactonization are employed to construct the lactone moieties presented in Alstomicine and Alstofolinine A, respectively.
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