Synthesis of the C(2)-C(13) fragment (the A-B spiroketal unit) of spongistatin 1 (altohyrtin A): use of a common intermediate for the synthesis of both spongistatin spiroketals

Academic Article
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publication date

  • 2002

abstract

  • [reaction: see text] A convergent synthesis of 14 corresponding to the A-B spiroketal core of spongistatin 1 has been accomplished via an iodo-spiroketalization reaction of glycal 9, which was synthesized in three steps from a late-stage intermediate used in our synthesis of the C-D spiroketal fragment of spongistatin 1. Elaboration of 14 to the A-B spiroketal 15 was accomplished in three steps.