732298-13-4

Upstream product

• 1486-48-2 3,4,5-tribenzyloxybenzoic acid 
• 20728-73-8 5,7,3',4'-tetra-O-benzyl-(+)-catechin 
• 1486-47-1 3,4,5-tris(benzyloxy)benzoyl chloride 
• 100-39-0 benzyl bromide 
• 154-23-4 catechin 
• 362632-29-9 (E)-3-(3,4-bis(benzyloxy)phenyl)prop-2-en-1-ol 
• 203571-40-8 3-(3,4-bis-benzyloxy-phenyl)-acrylic acid ethyl ester 
• 63604-98-8 1,3-dibenzylphloroglucinol 
• 5447-02-9 3,4-dibenzyloxybenzaldehyde 
• 918158-03-9 (1S,2S)-3-[2,4-Bis-benzyloxy-6-(tert-butyl-dimethyl-silanyloxy)-phenyl]-1-(3,4-bis-benzyloxy-phenyl)-propane-1,2-diol 
• 918157-97-8 (E)-3-[2,4-bis(benzyloxy)-6-(tert-butyldimethylsilyloxy)phenyl]-1-[3,4-bis(benzyloxy)phenyl]propene 
• 732298-08-7 (E)-3-[2,4-bis(benzyloxy)-6-hydroxyphenyl]-1-[3,4-bis(benzyloxy)phenyl]propene 

Downstream Products

• 223387-33-5 C₁₄₂H₁₁₈O₂₀ 
• 863-03-6 (+)-catechin 3-O-gallate 
• 223387-33-5 [4,8’]-2,3-trans-3.4-trans:2’,3’-trans-Octabenzyloxy-bi-(+)-catechin-3,3”-di-(tribenzyloxy)gallate 

Relevant academic research and scientific papers

Molecular Mechanism by Which Tea Catechins Decrease the Micellar Solubility of Cholesterol

Tea polyphenols lower the levels of cholesterol in the blood by decreasing the cholesterol micellar solubility. To clarify this mechanism, the interactions between taurocholic acid and (-)-epigallocatechin gallate (EGCg) and its derivatives were investigated. 13C NMR studies revealed remarkable chemical-shift changes for the carbonyl carbon atom and the 1″- and 4″-positions in the galloyl moiety. Furthermore, 1H NMR studies using (-)-EGCg derivatives showed that the number of hydroxyl groups on the B ring did not affect these interactions, whereas the carbonyl carbon atom and the aromatic ring of the galloyl moiety had remarkable effects. The configuration at the 2- and 3-positions of the catechin also influenced these interactions, with the trans-configuration resulting in stronger inhibition activity than the cis-configuration. Additionally, a 1:1 component ratio for the catechin-taurocholic acid complex was determined by electrospray ionization-mass spectrometry. These molecular mechanisms contribute to the development of cholesterol-absorption inhibitors.

Stereoselective synthesis of procyanidin B3-3-O-gallate and 3,3″-di-O-gallate, and their abilities as antioxidant and DNA polymerase inhibitor

A simple method for the synthesis of procyanidin B3 substituted with a galloyl group at the 3 and 3″ position is described. Condensation of a benzylated catechin-3-O-gallate electrophile with a nucleophile, catechin and catechin-3-O-gallate, proceeded smoothly and stereoselectively to afford the corresponding dimer gallates, procyanidin B3-3-O-gallate and procyanidin B3-3,3″-di-O-gallate, in good yields. Further, their antioxidant activities on UV-induced lipid peroxide formation, DPPH radical scavenging activity and inhibitory activity of DNA polymerase were also investigated. Among three procyanidin B3 congeners (procyanidin B3, 3-O-gallate and 3,3″-di-O-gallate), the 3,3″-di-O-gallate derivative showed the strongest antioxidant and radical scavenging activity. Interestingly, the 3-O-gallate derivative was the strongest inhibitor of mammalian DNA polymerase α with IC50 value of 0.26 μM, although it showed the weakest antioxidant and radical scavenging activity. It became apparent that the presence of a galloyl group at the C-3 position in the proanthocyanidin oligomer was very important for biological activity, however, the antioxidant activity of these compounds was not parallel to the DNA polymerase inhibitory activity. Graphical Abstract

Study of the green tea polyphenols catechin-3-gallate (CG) and epicatechin-3-gallate (ECG) as proteasome inhibitors

The green tea polyphenol catechin-3-gallate (CG) and epicatechin-3-gallate (ECG) were synthesized enantioselectively via a Sharpless hydroxylation reaction followed by a diastereoselective cyclization. Their potencies to inhibit the proteasome activity were measured. The unnatural enantiomers were found to be equally potent to the natural compounds.