Metal-Free Diastereo- and Enantioselective Dearomative Formal [3 + 2] Cycloaddition of 2-Nitrobenzofurans and Isocyanoacetate Esters

Org Lett. 2022 Mar 25;24(11):2149-2154. doi: 10.1021/acs.orglett.2c00427. Epub 2022 Mar 16.

Abstract

The diastereo- and enantioselective dearomative formal [3 + 2] cycloaddition of 2-nitrobenzofurans and α-aryl-α-isocyanoacetate esters provides tricyclic compounds bearing the 3a,8b-dihydro-1H-benzofuro[2,3-c]pyrrole framework with three consecutive stereogenic centers. The reaction was enabled by a cupreine-ether organocatalyst. The reaction products were obtained with almost full diastereoselectivity and with excellent enantiomeric excesses for a number of substituted 2-nitrobenzofurans and isocyanoacetates.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzofurans
  • Catalysis
  • Cycloaddition Reaction
  • Esters*
  • Stereoisomerism

Substances

  • Benzofurans
  • Esters
  • 2-nitrobenzofuran