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Synthesis of substituted 2 H [1]benzopyrans from coumarins and chromones
Author(s) -
Alberola A.,
Ortega A. González,
Pedrosa R.,
Bragado J. L. Pérez,
Rodríguez Amo J. F.
Publication year - 1983
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570200341
Subject(s) - benzopyrans , chemistry , propenyl , benzopyran , phenols , organic chemistry
A convenient route to substituted 2 H [1]benzopyrans is described in which trialkylaluminium compounds are added to coumarins or chromones and the resultant Z ‐2‐(3‐hydroxy‐1‐propenyl)phenols are converted by thermal cyclization in the presence of silica gel to 2 H [l]benzopyrans.