Heterocyclic Compounds
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ChemInform Abstract: A Convenient Synthesis of Azolo-Fused 2H-(1)Benzopyrans.
First published: February 28, 1995
Abstract
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ChemInform Abstract
A general one-pot method for the synthesis of pyranobenzazoles, e.g. ( III), (VI), (VIII) and (X), involves regiospecific addition of aldehyde (II) to an in situ generated heterocyclic titanium phenolate and subsequent intramolecular cyclization. In case of (Id) a side reaction yields by-product (IV).
