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Synthesis of 14 C‐labeled benzofurano[2,3‐b] benzopyran‐6‐one and its 4‐hydroxycoumarin derivative
Author(s) -
Chubachi Mitsuo,
Kawano Eiko
Publication year - 1987
Publication title -
journal of labelled compounds and radiopharmaceuticals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 47
eISSN - 1099-1344
pISSN - 0362-4803
DOI - 10.1002/jlcr.2580240710
Subject(s) - chemistry , 4 hydroxycoumarin , benzopyran , coumarin , derivative (finance) , hydrolysis , hydrazone , isopropyl , alkaline hydrolysis , medicinal chemistry , stereochemistry , organic chemistry , financial economics , economics , catalysis
Abstract 2‐Isopropyl‐8,9‐dimethoxy‐benzofurano [2,3‐b]furo[2,3‐h] [1] [11‐ 14 C]benzopyran‐6‐one ( IVb ) and 3‐(2‐hydroxy‐4,5‐dimethoxyphenyl)‐4‐hydroxy‐5′‐isopropylfurano[2′,3′:7,8] [2‐ 14 C]coumarin( Vb ) were prepared from isorotenone ( Ib ) for use in metabolic and other studies. Deoxybenzoin derivative ( IIb ), obtained from isorotenone, was reacted with ethyl [ 14 C] formate in the presence of sodium to give the corresponding [2‐ 14 C]‐2′‐hydroxyisoflavone ( IIIb ), which was transformed into the 14 C‐labeled benzofurano [2,3‐b]furo[2,3‐h]benzopyran‐6‐one compound ( IVb ) by the subsequent oxidative cyclization with selenium dioxide. Hydrolysis of compound IVb in alkaline media gave 14 C‐labeled 4‐hydroxycoumarin ( Vb ).