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Benzopyrans
About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.
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TL;DR: In this article, a stereocontrolled synthetic approach to E and Z -substituted methylene-3,4-dihydro-2 H -1-benzopyrans is described from acyclic derivatives using as a key step the palladium-catalyzed intramolecular cyclic carbopalladation of iodoalkynes.
Abstract: A stereocontrolled synthetic approach to E - and Z -substituted methylene-3,4-dihydro-2 H -1-benzopyrans 5 is described from acyclic derivatives using as a key step the palladium-catalyzed intramolecular cyclic carbopalladation of iodoalkynes 4 followed by a carbonylation or a hydride ion capture process.
TL;DR: In this paper, a sequence of reactions viz. intramolecular cyclization of nitrile oxides, reductive cleavage, and acetylation were used to synthesize functionalized benzopyran derivatives.
Abstract: Various functionalized benzopyran derivatives have been synthesized in good yields by a sequence of reactions viz. intramolecular cyclization of nitrile oxides, reductive cleavage, and acetylation.
TL;DR: A wide range of 2-alkenyl-4-alkynyl benzopyrans are efficiently obtained with good diastereoselectivity as mentioned in this paper, and they can be expressed as
Abstract: A wide range of 2-alkenyl-4-alkynyl benzopyrans are efficiently obtained with good diastereoselectivity.