4.8 Article

Constructing Quaternary Stereogenic Centers Using Tertiary Organocuprates and Tertiary Radicals. Total Synthesis of trans-Clerodane Natural Products

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 2, Pages 660-663

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja512527s

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Funding

  1. National Science Foundation [CHE1265964]
  2. Swiss National Science Foundation
  3. German Academic Exchange Service (DAAD)
  4. Direct For Mathematical & Physical Scien [1265964] Funding Source: National Science Foundation
  5. Division Of Chemistry [1265964] Funding Source: National Science Foundation

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A new concise construction of trans-clerodane diterpenoids is reported in which oxacyclic and trans-hydronaphthalene fragments are coupled, and the critical C9-quaternary carbon stereocenter formed stereoselectively, by 1,6-addition of a tertiary cuprate or a tertiary carbon radical to beta-vinylbutenolide. This strategy is specifically illustrated by total syntheses of (-)-solidagolactone (4), (-)-16-hydroxycleroda-3,13-dien-15,16-olide (5, PL3), and (-)-annonene (6).

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