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237 Result(s)
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Article
Modified Neoflavones Based on 7-Hydroxyneoflavone-6-Enamino Ketone and 7-Hydroxy-3-Hetarylbenzopyran-2- and 4-Ones Mannich Bases and Their Recyclization
The interaction of 7-hydroxyneoflavone-6-enamino ketone with 8-dialkylamino-7-hydroxy-3-hetarylbenzopyran-2- and 4-ones led to the formation of 10-methyl-4-phenyl-2H,6H-pyrano[3,2-g]-chromen-2,6-dione, which inco...
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Article
Flavonoids from Erigeron annuus
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Article
Synthesis and Recyclization of Methylenebisflavonoids Based on Heterocyclic Analogs of Umbelliferone and Formononetin
The methylenebisflavonoids 7-hydroxy-3-hetaryl-8-(4-oxo-4H-3-chromenylmethyl)-4H-4-chromenones and 7-hydroxy-3-hetaryl-8-(4-oxo-4H-3-chromenylmethyl)-2H-2-chromenones were synthesized via the reaction of 7-hydrox...
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Article
Progress in the Chemistry of Amino-Acid Derivatives of Isocoumarins and 3,4-Dihydroisocoumarins
Approaches to the synthesis of isocoumarins and 3,4-dihydroisocoumarins containing natural or synthetic amino-acid fragments are reviewed. Most attention is paid to the two most numerous groups of natural 3,4-...
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Article
Synthesis of Furoneoflavones Modified by Coumarin and (HET)Aroyl Substituents
Furo[3,2-g]neoflavones and furo[2,3-h]neoflavones modified by coumarin and (het)aroyl substituents were synthesized via reactions of 7-hydroxy-6(8)-acetyl(formyl)neoflavones with substituted phenacyl bromides,...
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Article
Synthesis of Benzofurans Modified by Coumarin and Pyrazole Heterocycles
Reactions of 7-hydroxy-2-methyl-8-formylisoflavone with 4-chloromethylcoumarins synthesized 8-(coumarin-4-yl)furo[2,3-h]chromones, which reacted with 2-bromoacetylbenzofuran to produce 8-(benzofuroyl)furo [2,3-h]...
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Article
Amino-Acid Derivatives of Pyranocoumarins
A methodology for synthesizing amino-acid derivatives of pyranocoumarins in three steps using pyranocoumarin oximes as starting compounds was developed. A series of pyranocoumarins containing the amino acids g...
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Article
Synthesis of 7-Hydroxy-8-Methyl-4'-Methoxy-6-Formylisoflavone and Linear Hetarenochromones Based on It
7-Hydroxy-8-methyl-4'-methoxy-6-formylisoflavone was synthesized from the 6-aminomethyl derivative of 7-hydroxychromone under modified Duff reaction conditions and underwent heterocyclization to form linear furo-...
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Article
Neoflavonoid Angelicin Derivatives
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Article
Conjugation of the Alkaloid Anabasine to Coumarins
The possibility of using the alkaloid anabasine in Mannich aminomethylation of coumarins was studied. Anabasine-coumarin conjugates in which the benzopyrone core was conjugated to anabasine through a methylene...
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Article
Recent Progress in the Synthesis of 4-Arylcoumarins
Current approaches to the synthesis of 4-arylcoumarins (neoflavones) are reviewed. This is an important group of O-containing natural flavonoids that are widely used not only to prepare natural and synthetic n...
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Article
Synthesis of Isoflavone-Anabasine Conjugates
Possible Mannich aminomethylation of isoflavone chromone rings was studied using the alkaloid anabasine. Anabasine-isoflavone conjugates in which the benzopyrone core was connected to anabasine through a methy...
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Article
Furo[2,3-h]Chromones and Pyrano[2′,3′:5,6]Chromeno [4,3-B]Pyridines Based on Natural Isoflavones
Furo[2,3-h]chromone and pyrano[2′,3′:5,6]chromeno[4,3-b]pyridine derivatives were synthesized from 7-hydroxy-8-formylisoflavones, which were prepared from natural isoflavones using a Duff reaction, via reactio...
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Article
Synthesis and Modification of 6-thiazolyl-4-methylumbelliferone
6-(2-Methylthiazol-4-yl)-4-methylumbelliferone derivatives were synthesized from 4-(1,3-thiazol-4-yl)-1,3-benzenediols via a Pechmann reaction and were modified by acylation and aminomethylation.
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Article
Synthesis of 6-Isoxazolyl Derivatives of 4-Methylumbelliferone
A two-step synthesis of 6-(5-isoxazolyl)coumarins was developed. Recyclization of 7-hydroxychromones by hydroxylamine into 4-(5-isoxazolyl)-1,3-benzenediols followed by condensation with acetoacetic ester prod...
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Article
3-Aryl-3,4-Dihydroisocoumarins with Amino-Acid Fragments
New amino-acid derivatives of 3-aryl-3,4-dihydroisocoumarins were prepared via acylation of the amine of natural amino acids by phenoxyacetic acids containing 3,4-dihydroisocoumarin substituents on the benzene...
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Article
New Aloperine–Isoflavone Conjugates
The reaction of aloperine with isoflavone glycidyl ethers was investigated. A series of alkaloid–isoflavonoid conjugates were synthesized via regioselective opening of the oxirane ring by aloperine.
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Article
Synthesis Of 4-Aryl-5-[2-Hydroxy-4-(2-Cytisin-12-Ylethoxy)Phenyl]Isoxazoles
Recyclization of N 12-cytisinylethoxy derivatives of natural isoflavonoids and their analogs through the action of hydroxylamine was studied. Substituted 4-aryl-5-(2-hydroxyphenyl)isoxazol...
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Article
Synthesis of Aloperine-Containing Mannich Bases of Isoflavones
The possibility of using the alkaloid aloperine for aminomethylation of a chromone ring was studied. A series of 8-(aloperin-12-yl)methyl-substituted isoflavone derivatives were synthesized.
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Article
Synthesis of 6-(3-Pyrazolyl)-4-Methylumbelliferone Derivatives Substituted on the Pyrazole Ring
A two-step synthesis of 6-(3-pyrazolyl)coumarins starting from 7-hydroxy(acetoxy)chromones was developed. It included their recyclization using hydrazine hydrate into 4-(3-pyrazolyl)-1,3-benzened...