Topic
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 carbanion-olefin intramolecular 6-endo-trig cyclization reaction was used to provide 2-aroyl-3,4-dihydro-2H-benzopyrans.
Abstract: Utilization of a novel carbanion-olefin intramolecular 6-endo-trig cyclization reaction to provide 2-aroyl-3,4-dihydro-2H-benzopyrans is described. Through a sequence of a Wittig reaction, O-alkylation, and carbanion-olefin intramolecular cyclization, salicylaldehydes were converted into a series of new 2-aroyl-3,4-dihydro-2H-benzopyrans in two steps or in one-pot reaction.
TL;DR: 3,4-Dihydro-2, 4-dimethoxy-2-methyl-2H-1-benzopyrans are formed in high yields by the cyclocondensation of o-hydroxybenzaldehydes with 2,2-dimethylpropane catalysed by elemental iodine at room temperature.
Abstract: 3,4-Dihydro-2,4-dimethoxy-2-methyl-2H-1-benzopyrans are formed in high yields by the cyclocondensation of o-hydroxybenzaldehydes with 2,2-dimethoxypropane catalysed by elemental iodine at room temperature.
TL;DR: The pyranobenzopyran derivatives (1a, b) and (1b) have been prepared by a simple route from m-methoxyphenol.
Abstract: The pyranobenzopyran derivatives (1a) and (1b) have been prepared by a simple route from m-methoxyphenol.
TL;DR: In this paper, the synthesis of functionalized 2,2-disubstituted 2 H -1-benzopyrans was achieved by condensing 2,3,5-trimethylhydroquinone (TMHQ) with α,β-unsaturated aldehydes or α, β-unaturated acetals under acidic conditions.
Abstract: The synthesis of functionalized 2,2-disubstituted 2 H -1-benzopyrans was achieved by condensing 2,3,5-trimethylhydroquinone (TMHQ) with α,β-unsaturated aldehydes or α,β-unsaturated acetals under acidic conditions.