Remote Friedel-Crafts Reaction with α-Heteroaryl-Substituted Cyclic Ketones via HOMO Activation of Lewis Bases

Org Lett. 2019 Sep 20;21(18):7554-7557. doi: 10.1021/acs.orglett.9b02827. Epub 2019 Aug 30.

Abstract

Under the catalysis of Lewis bases, cyclic enones bearing an α-(2-furyl) motif can undergo remote Friedel-Crafts reaction with electrophilic reagents via a HOMO-activation strategy, proceeding in a formal vinylogous Rauhut-Currier or Morita-Baylis-Hillman-type reaction pattern. Moreover, even less reactive α-(2-benzofuranyl)-substituted cyclopeten-2-ones can be similarly HOMO-raised and furnish [4 + 2] products with alkylidenemalononitriles in a cascade Friedel-Crafts/Michael addition process.