Reagent-Controlled Regiodivergent Annulations of Achmatowicz Products with Vinylogous Nucleophiles: Synthesis of Bicyclic Cyclopenta[ b]pyrans and 8-Oxabicyclo[3.2.1]octane Derivatives

Org Lett. 2022 Oct 28;24(42):7806-7811. doi: 10.1021/acs.orglett.2c03127. Epub 2022 Oct 19.

Abstract

Two reagent-controlled regiodivergent annulation protocols for Achmatowicz products with vinylogous nucleophiles have been developed, which furnished a series of bicyclic cyclopenta[b]pyrans and 8-oxabicyclo[3.2.1]octane derivatives in 28-90% yields. Plausible mechanisms were proposed to involve either Pd-catalyzed Tsuji-Trost allyl-allyl coupling and concomitant Michael cyclization or quinine-promoted cascade stepwise [5 + 2] cycloaddition and intramolecular Michael cyclization.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Indicators and Reagents
  • Octanes*
  • Pyrans*
  • Stereoisomerism

Substances

  • octane
  • Octanes
  • Pyrans
  • Indicators and Reagents