40918-90-9Relevant academic research and scientific papers
Incorporation of catechyl monomers into lignins: Lignification from the non-phenolic end: Via Diels-Alder cycloaddition?
Ando, Daisuke,Boerjan, Wout,Elder, Thomas J.,Eugene, Alexis,Kim, Hoon,Lu, Fachuang,Ralph, John,Tobimatsu, Yuki,Vanholme, Ruben
, p. 8995 - 9013 (2021/11/27)
Canonical lignification occurs via the coupling of phenolic radicals, in which chain extension can occur only from phenolic ends of growing polymer chains. Radical coupling of catechyl monomers, including caffeyl and 5-hydroxyconiferyl alcohols, gives ris
Laccase-catalyzed oxidation of allylbenzene derivatives: Towards a green equivalent of ozonolysis
Antoniotti, Sylvain,Blerot, Bernard,Chietera, Giorgiana,Lecourt, Mathilde
supporting information, (2021/10/19)
Laccase-based biocatalytic reactions have been tested with and without mediators and optimized in the oxidation of allylbenzene derivatives, such as methyl eugenol taken as a model substrate. The reaction primarily consisted in the hydroxylation of the propenyl side chain, either upon isomerization of the double bond or not. Two pathways were then observed; oxidation of both allylic alcohol intermediates could either lead to the corresponding α,β-unsaturated carbonyl com-pound, or the corresponding benzaldehyde derivative by oxidative cleavage. Such a process consti-tutes a green equivalent of ozonolysis or other dangerous or waste-generating oxidation reactions. The conversion rate was sensitive to the substitution patterns of the benzenic ring and subsequent electronic effects.
Gold-Catalyzed [2,3]-Sigmatropic Rearrangement: Reaction of Aryl Allyl Alcohols with Diazo Compounds
Rao, Santhosh,Prabhu, Kandikere Ramaiah
, p. 846 - 849 (2017/02/26)
A gold-catalyzed [2,3]-sigmatropic rearrangement reaction has been developed. The intermolecular rearrangement occurs between in situ generated donor-acceptor gold-carbenes and cinnamyl alcohols via tandem oxonium ylide formation. The desired rearranged product has been accomplished selectively over more conventional O-H insertion, cyclopropanation, cycloaddition, and C-H functionalization products under mild, open-air conditions. The scope of the work has been illustrated by synthesizing a new class of substrates that can be used for constructing complex molecular targets.
A Mixed-Ligand Chiral Rhodium(II) Catalyst Enables the Enantioselective Total Synthesis of Piperarborenine B
Panish, Robert A.,Chintala, Srinivasa R.,Fox, Joseph M.
, p. 4983 - 4987 (2016/04/26)
A novel, mixed-ligand chiral rhodium(II) catalyst, Rh2(S-NTTL)3(dCPA), has enabled the first enantioselective total synthesis of the natural product piperarborenine B. A crystal structure of Rh2(S-NTTL)3(dCPA) r
PHARMACEUTICAL COMPOSITIONS COMPRISING LIGNANS AND THEIR DERIVATIVES FOR TREATING HYPERPLASTIC DISEASES
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Page/Page column 48, (2016/11/07)
The present invention relates to a pharmaceutical composition comprising specific compounds which may be obtained from Leontopodium alpinum Cass. (Edelweiss). A preferred compound is leoligin (=(2S,3R,4R)-4-(3,4-dimethoxybenzyl) -2-(3,4-dimethoxyphenyl)tetrahydrofuran-3-yl]methyl(2Z)-2-methylbut-2-enoat]). Corresponding means and methods in respect of medical uses of the compounds are described. The present invention also provides a medical device comprising, containing or having been contacted with the compound. The compounds provided herein may particularly be used in the treatment of hyperplastic diseases, in particular intimal hyperplasia, e.g. stenosis, restenosis, atherosclerosis and the like. Also envisaged herein is the use of these compounds in the treatment of proliferative diseases, such as leukemia, prostate cancer and lung cancer.
Multifunctional novel Diallyl disulfide (DADS) derivatives with β-amyloid-reducing, cholinergic, antioxidant and metal chelating properties for the treatment of Alzheimer's disease
Manral, Apra,Saini, Vikas,Meena, Poonam,Tiwari, Manisha
, p. 6389 - 6403 (2015/10/05)
A series of novel Diallyl disulfide (DADS) derivatives were designed, synthesized and evaluated as chemical agents, which target and modulate multiple facets of Alzheimer's disease (AD). The results showed that the target compounds 5a-l and 7e-m exhibited significant anti-Aβ aggregation activity, considerable acetylcholinesterase (AChE) inhibition, high selectivity towards AChE over butyrylcholinesterase (BuChE), potential antioxidant and metal chelating activities. Specifically, compounds 7k and 7l exhibited highest potency towards self-induced Aβ aggregation (74% and 71.4%, 25 μM) and metal chelating ability. Furthermore, compounds 7k and 7l disaggregated Aβ fibrils generated by Cu2+-induced Aβ aggregation by 80.9% and 78.5%, later confirmed by transmission electron microscope (TEM) analysis. Besides, 7k and 7l had the strongest AChE inhibitory activity with IC50 values of 0.056 μM and 0.121 μM, respectively. Furthermore, molecular modelling studies showed that these compounds were capable of binding simultaneously to catalytic active site (CAS) and peripheral anionic site (PAS) of AChE. All the target compounds displayed moderate to excellent antioxidant activity with ORAC-FL values in the range 0.546-5.86 Trolox equivalents. In addition, absorption, distribution, metabolism and excretion (ADME) profile and toxicity prediction (TOPKAT) of best compounds 7k and 7l revealed that they have drug like properties and possess very low toxic effects. Collectively, the results strongly support our assertion that these compounds could provide good templates for developing new multifunctional agents for AD treatment.
Improved synthesis of natural ester sintenin and its analogues via Wittig reaction
Sharma, Mukul,Rajesh, U. Chinna,Rawat, Diwan S.
, p. 1853 - 1860 (2014/01/17)
The synthesis of a cytotoxic natural ester sintenin (7a) and twenty eight of its analogues including nitrogen-containing heterocyclic indole moiety (7b-7t), saturated (10a-10d) and unsaturated (10e-10h) amides were carried out by convenient route via one-pot Wittig reaction in aqueous medium with improved yield. A systematic structure activity relationship of sintenin ester was designed by chemically modified derivatives in order to get better cytotoxicity.
Synthesis of some phenylpropanoid glycosides (PPGs) and their acetylcholinesterase/xanthine oxidase inhibitory activities
Li, Xiao-Dong,Kang, Shuai-Tao,Li, Guo-Yu,Li, Xian,Wang, Jin-Hui
, p. 3580 - 3596 (2011/07/07)
In this research, three categories of phenylpropanoid glycosides (PPGs) were designed and synthesized with PPGs isolated from Rhodiola rosea L. as lead compounds. Their inhibitory abilities toward acetylcholinesterase (AChE) and xanthine oxidase (XOD) were also tested. Some of the synthetic PPGs exhibited excellent enzyme inhibitory abilities.
Engineering monolignol 4-O-methyltransferases to modulate lignin biosynthesis
Bhuiya, Mohammad-Wadud,Liu, Chang-Jun
experimental part, p. 277 - 285 (2010/12/19)
Lignin is a complex polymer derived from the oxidative coupling of three classical monolignols. Lignin precursors are methylated exclusively at the meta-positions (i.e. 3/5-OH) of their phenyl rings by native O-methyltransferases, and are precluded from substitution of the para-hydroxyl (4-OH) position. Ostensibly, the para-hydroxyls of phenolics are critically important for oxidative coupling of phenoxy radicals to form polymers. Therefore, creating a 4-O-methyltransferase to substitute the para-hydroxyl of monolignols might well interfere with the synthesis of lignin. The phylogeny of plant phenolic O-methyltransferases points to the existence of a batch of evolutionarily plastic amino acid residues. Following one amino acid at a time path of directed evolution, and using the strategy of structure-based iterative site-saturation mutagenesis, we created a novel monolignol 4-O-methyltransferase from the enzyme responsible for methylating phenylpropenes. We show that two plastic residues in the active site of the parental enzyme are vital in dominating substrate discrimination. Mutations at either one of these separate the evolutionarily tightly linked properties of substrate specificity and regioselective methylation of native O-methyltransferase, thereby conferring the ability for para-methylation of the lignin monomeric precursors, primarily monolignols. Beneficial mutations at both sites have an additive effect. By further optimizing enzyme activity, we generated a triple mutant variant that may structurally constitute a novel phenolic substrate binding pocket, leading to its high binding affinity and catalytic efficiency on monolignols. The 4-O-methoxylation of monolignol efficiently impairs oxidative radical coupling in vitro, highlighting the potential for applying this novel enzyme in managing lignin polymerization in planta.
An efficient route to xanthine based A2A adenosine receptor antagonists and functional derivatives
Labeaume, Paul,Dong, Ma,Sitkovsky, Michail,Jones, Elizabeth V.,Thomas, Rhiannon,Sadler, Sara,Kallmerten, Amy E.,Jones, Graham B.
supporting information; experimental part, p. 4155 - 4157 (2010/10/21)
A one-pot route to 8-substituted xanthines has been developed from 5,6-diaminouracils and carboxaldehydes. Yields are good and the process applicable to a range of substrates including a family of A2A adenosine receptor antagonists. A new route to the KW-6002 family of antagonists is presented including a pro-drug variant, and application to related image contrast agents developed.
