01600nas a2200169 4500008004100000245010900041210006900150260000800219300001400227490000700241520094600248100001701194700003301211700002401244700002201268856014001290 2016 eng d00aSynthesis of 4H-chromenes by an unexpected, K3PO4-mediated intramolecular rauhut–currier type reaction0 aSynthesis of 4Hchromenes by an unexpected K3PO4mediated intramol cAPR a5612-56160 v143 a

In an attempt to develop the umpolung of Michael acceptors using chalcones having an enoate moiety under N-heterocyclic carbene (NHC) catalysis, a K3PO4-mediated intramolecular Rauhut–Currier type reaction was observed. This C(sp2)–C(sp2) coupling reaction afforded the biologically important 4H-chromenes in moderate to good yields. It is likely that the enol ether functionality acts as the nucleophilic trigger in this reaction.

1 aBhunia, Anup1 aYetra, Santhivardhana, Reddy1 aGonnade, Rajesh, G.1 aBiju, Akkattu, T. uhttps://library.ncl.res.in/content/synthesis-4h-chromenes-unexpected-k3po4-mediated-intramolecular-rauhut%E2%80%93currier-type-reaction