Journal
TETRAHEDRON LETTERS
Volume 42, Issue 35, Pages 6163-6166Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(01)01234-5
Keywords
coumaronochromones; 2 '-hydroxyisoflavones; oxidative cyclization; o-chloranil
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4 ' ,5,7-Trihydroxy- or 8-alkyl-4 ' .5,7-trihvclroxycoumaronochromones were synthesized by oxidative cyclization of the corresponding 2 ' -hydroxyisoflavones with o-chloranil under mild conditions. By contrast, alkoxycoumaronochromones were synthesized by oxidative cyclization of the corresponding 2 ' -hydroxyisoflavones with DDQ. (C) 2001 Elsevier Science Ltd. All rights reserved.
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