The synthesis and utility of unprecedented fluorenofurans 7 and oxa-s-indacenones 8 as key intermediates for synthesis of methoxsalen 1 is described, illustrating a novel synthetic approach to furocoumarins.
Regiospecific Synthesis of 7-Hydroxyindoles from Pyrroles by Anionic Benzannulation
作者:Bidyut Kumar Dinda、Shyam Basak、Dipakranjan Mal
DOI:10.1002/ejoc.201402486
日期:2014.9
expedient route to densely substituted 7-hydroxyindoles. Intrinsic to the methodology, the resulting substituents are disposed in a fully regiocontrolled manner. The methodology is applicable to the synthesis of 7-hydroxybenzofurans. None of the indoles/benzofurans or pyrrole synthons synthesized in this study have hitherto been reported.