Fluorous-Phase Approach to α-Hydroxytropolone Synthesis

J Org Chem. 2018 Feb 2;83(3):1478-1485. doi: 10.1021/acs.joc.7b03032. Epub 2018 Jan 22.

Abstract

α-Hydroxytropolones (αHTs) are troponoids that demonstrate inhibition against an array of therapeutically significant targets, making them potential drug leads for several human diseases. We have utilized a recently discovered one-pot three-component oxidopyrylium cycloaddition in a solid-supported synthesis of αHTs. Though the procedure is time efficient and generates assay-ready molecules, the system suffers from low yields and an inability to perform reaction modifications on resin-bound intermediates. In order to combat these issues with the solid-phase platform, we incorporated fluorous tags into our synthetic route. Through the implementation of fluorous phase chemistry, we demonstrate a substantial increase in the overall yield of αHTs, as well as an ability to execute metal-catalyzed cross coupling and amide coupling on fluorous tagged intermediates. We also show that tagged molecules can be separated from nonfluorous impurities, and vice versa, by utilizing fluorous liquid-liquid and solid-phase extractions. Hence, these proof-of-principle investigations describe the viability of a fluorous phase approach to αHT synthesis and its potential to serve as a combinatorial technique to produce structurally diverse substrates.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Fluorides / chemistry*
  • Molecular Structure
  • Tropolone / analogs & derivatives
  • Tropolone / chemical synthesis*
  • Tropolone / chemistry

Substances

  • Tropolone
  • Fluorides