Synthesis Of Pyranocoumarins Research Articles

ChemInform Abstract: Silica‐Supported Molybdic Acid: Preparation, Characterization, and Its Catalytic Application in Synthesis of Pyranocoumarins.

AbstractSilica‐supported molybdic acid appears to be a novel, recyclable and safe catalyst for the three‐component condensation of 4‐hydroxycoumarin with aldehydes and malononitrile furnishing pyranocoumarins (IV) (14 examples) in high yield.

Silica-supported molybdic acid: preparation, characterization, and its catalytic application in synthesis of pyranocoumarins

Silica-supported molybdic acid was employed as novel, recyclable, and safe catalyst in a one-pot three-component condensation of aldehydes, malononitrile, and 4-hydroxycoumarin to produce new and known pyrano[2,3-c]chromenes as potent biologically active compounds. This expedient new route has advantages, such as the use of a safe and reusable catalyst, simple operation, short reaction times, and good to excellent yields. The silica-supported molybdic acid as a novel solid acid was characterized by X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy.

A Concise Route for the Synthesis of Biologically Interesting Pyranocoumarins. Seselin, (.+‐.)‐cis‐Khellactone, (.+‐.)‐Quianhucoumarin D, and the (.+‐.)‐5‐Deoxyprotobruceol‐I Regioisomer.

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One-Pot Synthesis of 2H-Pyrans by Indium(III) Chloride-Catalyzed Reactions.Efficient Synthesis of Pyranocoumarins, Pyranophenalenones, and Pyranoquinolinones

An efficient synthesis of 2H-pyrans is achieved by indium (III) chloride-catalyzed reactions of 1,3-dicarbonyl compounds with a variety of <TEX>$\alpha\beta-unsaturated$</TEX>, aldehydes in moderate yields. This method has been applied to the synthesis of pyranocoumar ins, pyranophenalenones, and pyranoquinolinone alkaloids.

Synthesis of a Key Intermediate for the Synthesis of Pyranocoumarins. Contrasting Reactivity in the 1,2-and 1,4-Reduction of an Unsaturated Carbonyl System

Abstract [2,2-dimethyl-4-(t-butyldimethylsiloxy)-3,4-dihydro-2H-pyran-6-yl] methanal (1) was synthesized from commercially available butopyronoxyl (2). The selectivity of reducing agents such as DIBAL-H and LiAlH4 towards butopyronoxyl was studied. Solvent effects were found to influence 1,2 versus 1,4 reduction.

ChemInform Abstract: SYNTHESIS OF PYRANOCOUMARINS. 10-METHYLXANTHYLETIN, 4,10-DIMETHYLXANTHYLETIN AND 10-METHYL-4-PHENYLXANTHYLETIN

ChemInform Abstract: SYNTHESIS OF PYRANOCOUMARINS. 10-METHYLXANTHYLETIN, 4,10-DIMETHYLXANTHYLETIN AND 10-METHYL-4-PHENYLXANTHYLETIN