Irradiation of the berberinephenolbetaine [1] effected valence tautamerization to give 8,14-cycloberbine[2], which was converted to the spirobenzylisoquinolines by regioselective C-N bond cleavage A variety of ring systems such as compounds [4], [5] a...
Irradiation of the berberinephenolbetaine [1] effected valence tautamerization to give 8,14-cycloberbine[2], which was converted to the spirobenzylisoquinolines by regioselective C-N bond cleavage A variety of ring systems such as compounds [4], [5] and [6] were indroduced by the structural modification of berberinephenolbetaine.