An unexpected thermal [1,3]-[1,3]-para rearrangement of chromone-3-ylmethyl aryl ethers: Mechanism and application of the intercepted [1,3]-rearranged intermediates to the synthesis of cis-homopterocarpans

Article abstract of DOI:10.1246/cl.141162

Chromone-3-ylmethyl aryl ethers with unsubstituted orthopositions have been found to undergo a novel domino [1,3]-[1,3]-rearrangement to give 4′-hydroxyhomoisoflavones under thermal conditions while the para-substituted ethers lead to 2′-hydroxyhomoisofla