29799-52-8

Upstream product

• 109718-31-2 (2R,3S)-2,3-trans-3-hydroxy-3',4',7,8-tetramethoxyflavan 
• 186581-53-3 diazomethane 
• 38081-15-1 (2R,3S,4S)-2-(3,4-Dihydroxy-phenyl)-chroman-3,4,7,8-tetraol 
• 20754-51-2 (+/-)-2r-(3,4-dimethoxy-phenyl)-3t-hydroxy-7,8-dimethoxy-chroman-4-one 
• 38076-45-8 2-(3,4-dimethoxy-phenyl)-3-hydroxy-7,8-dimethoxy-chromen-4-one 

Downstream Products

• 29799-82-4 (2R,3S,4S)-2,3-trans-3,4-cis-3,4-diacetoxy-3',4',7,8-tetramethoxyflavan 
• 106714-68-5 (+/-)-4t-(3,4-dimethoxy-phenyl)-6,7-dimethoxy-2,2-dimethyl-(3ar,9bc)-3a,9b-dihydro-4H-[1,3]dioxolo[4,5-c]chromene 
• 16883-94-6 (+/-)-7,8,3',4'-Tetramethoxy-2,3-cis-flavan-3,4-cis-diol-diacetat 
• 16821-06-0 (+/-)-4t-(3,4-dimethoxy-phenyl)-6,7-dimethoxy-(3ar,9bc)-3a,9b-dihydro-4H-[1,3]dioxolo[4,5-c]chromen-2-one 

Relevant academic research and scientific papers

REGIO- AND STEREOSELECTIVE OXYGENATION OF FLAVAN-3-OL-, 4-ARYLFLAVAN-3-OL-, AND BIFLAVANOID-DERIVATIVES WITH POTASSIUM PERSULPHATE

The phenolic methyl ethers of flavan-3-ols, 4-arylflavan-3-ols, and (-)-fisetinidol-(4,8)-(+)-catechin biflavanoids are susceptible to regio- and stereoselective hydroxylation at C-4 in moderate to high yields with potassium persulphate/cupric sulphate in aqueous acetonitrile.The resultant 4-functionalized analogues are of both synthetic and degradative significance in condensed tannin chemistry.

Synthesis of Condensed Tannins. Part 17. Oligomeric (2R,3S)-3,3',4',7,8-Pentahydroxyflavans: Atropisomerism and Conformation of Biphenyl and m-Terphenyl Analogues from Prosopis glandulosa ('Mesquite')

(2R,3S)-2,3-trans-3',4',7,8-Tetrahydroxyflavan-3-ol , the predominant metabolite in the heartwood of Prosopis glandulosa, represents a putative precursor of a variety of oligomers, including conventional - and -biflavan-3-ols, a -1,3-diarylpropylflavan-3-ol, - and atropisomeric -biphenyl-type biflavan-3-ols, and -m-terphenyl-type triflavan-3-ols.Other participants in these condensations are mainly (+)-catechin, and also the flavan-3,4-diol analogue of (+)-mesquitol.Oligomeric structures were confirmed by biomimetic oxidative and acid-induced couplings, and by nuclear Overhauser effect difference spectroscopy.These applications enabled correction of previous structural assignments for atropisomeric -(+)-mesquitol-(+)-catechins and -bis--(+)-catechins, and determination of their conformations.