1829-60-3Relevant academic research and scientific papers
Simple and convenient preparation of some bicyclic alcohols and epoxide derivatives: Promising antibiotic activities of (rac)-dimethyl 3,8-dioxatricyclo[3.2.1.02,4]oct-6-ene-6,7-dicarboxylate
Yilmaz, ?zgür,?im?ek Ku?, Nermin,Küce, Pinar,Coral, G?khan,?elik, Ayla,Gültekin, Mehmet Serdar
, p. 2709 - 2716 (2015)
The biological activity of alcohol and epoxide groups containing bicyclic skeletal structures was investigated in terms of antibiotic and toxic effects at cellular level. The present protocol, which utilizes readily available starting materials and mild reaction conditions, provides an attractive approach to a series of functionalized bicyclic alcohol and epoxide derivatives with promising biological applications. In this protocol, while some of the bicyclic compounds were synthesized as in the literature, the other bicyclic compounds were synthesized by new synthetic methods. The antibiotic and toxic properties of the synthesized bicyclic compounds were investigated, and some of their biological activities were tested in prokaryotic and eukaryotic systems. (rac)-Dimethyl 3,8-dioxatricyclo[3.2.1.02,4]oct-6-ene-6,7-dicarboxylate, one of the synthesized molecules that showed antibiotic activity, was tested in two different living systems (prokaryotic and eukaryotic) in terms of biological and toxic effects at cellular level using a peripheral lymphocyte culture assay. Mitotic index for this compound was calculated in lymphocyte cultures.
Palladium-Catalyzed Ortho-Silylation of Aryl Iodides with Concomitant Arylsilylation of Oxanorbornadiene: Accessing Functionalized (Z)-β-Substituted Vinylsilanes and Their Analogues
Lv, Weiwei,Wen, Si,Yu, Jia,Cheng, Guolin
, p. 4984 - 4987 (2018)
A palladium-catalyzed ortho-silylation of aryl iodides/arylsilylation of oxanorbornadiene/retro-Diels-Alder domino reaction was developed. Such a transformation provides access to various functionalized (Z)-β-substituted vinylsilanes with exclusive selectivity using hexamethyldisilane as a bis-silylation reagent and 2,3-dicarbomethoxy-7-oxanorbornadiene (ONBD) as an ortho-C-H activator and ethylene surrogate. A variety of (Z)-β-substituted vinylgermanes and (Z)-β-substituted vinylstannanes were also obtained under mild reaction conditions. This atom-economical, stereoselective, and scalable approach is compatible with a diverse range of readily available functionalized aryl iodides.
NBE-Controlled Palladium-Catalyzed Interannular Selective C-H Silylation: Access to Divergent Silicon-Containing 1,1′-Biaryl-2-Acetamides
Li, Wenguang,Chen, Wenqi,Zhou, Bang,Xu, Yankun,Deng, Guobo,Liang, Yun,Yang, Yuan
supporting information, p. 2718 - 2722 (2019/04/16)
A novel palladium-catalyzed interannular selective C-H silylation of 1,1′-biaryl-2-acetamides is described. The combination of palladium catalyst with copper oxidant enables meta- or ortho-selective C-H silylation by employing hexamethyldisilane as a trimethylsilyl source, which relies on the control of NBE derivatives as a switch, thus providing straightforward access to divergent silicon-containing 1,1′-biaryl-2-acetamides.
Regioselective arene homologation through rhenium-catalyzed deoxygenative aromatization of 7-oxabicyclo[2.2.1]hepta-2,5-dienes
Murai, Masahito,Ogita, Takuya,Takai, Kazuhiko
, p. 2332 - 2335 (2019/02/27)
Combined use of oxorhenium catalysts with triphenyl phosphite as an oxygen acceptor allowed efficient deoxygenative aromatization of oxabicyclic dienes. The reaction proceeded under neutral conditions and was compatible with various functional groups. Combining this deoxygenation with regioselective bromination and trapping of the generated aryne with furan resulted in benzannulative π-extension at the periphery of the PAHs. This enabled direct use of unfunctionalized PAHs for extension of π-conjugation. Iteration of the transformations increased the number of fused-benzene rings one at a time, which has the potential to alter the properties of PAHs by fine-tuning the degree of π-conjugation, shape, and edge topology.
METHOD TO PREPARE PHENOLICS FROM BIOMASS
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Paragraph 29; 30, (2016/08/10)
The present invention is directed to a method for preparing a final phenolic product from biomass comprising the steps of providing a furanic compound obtainable from biomass; reacting the furanic compound with a dienophile to obtain a phenolic compound; reacting the phenolic compound further to obtain the final phenolic product.
1,3-Dipolar Cycloaddition with Diazo Groups: Noncovalent Interactions Overwhelm Strain
Gold, Brian,Aronoff, Matthew R.,Raines, Ronald T.
supporting information, p. 4466 - 4469 (2016/09/28)
Like azides, diazoacetamides undergo 1,3-dipolar cycloadditions with oxanorbornadienes (OND) in a reaction that is accelerated by the relief of strain in the transition state. The cycloaddition of a diazoacetamide with unstrained ethyl 4,4,4-trifluoro-2-butynoate is, however, 35-fold faster than with the analogous OND because of favorable interactions with the fluoro groups. Its rate constant (k = 0.53 M-1 s-1 in methanol) is comparable to those of strain-promoted azide-cyclooctyne cycloadditions.
Diels-Alder reactions: The effects of catalyst on the addition reaction
Yilmaz, ?zgür,Kus, Nermin Simsek,Tun?, Tuncay,Sahin, Ertan
, p. 72 - 75 (2015/06/17)
Abstract The reaction between 2,3-dimethyl-1,3-butadiene and dimethyl 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate is efficiently achieved with small amounts of catalyst, i.e. phenol, AcOH, nafion, and β-cyclodextrin. Exo-diastereoselective cycloa
Photoinduced intramolecular cyclopentanation vs photoprotolytic oxametathesis in polycyclic alkenes outfitted with conformationally constrained aroylmethyl chromophores
Valiulin, Roman A.,Arisco, Teresa M.,Kutateladze, Andrei G.
, p. 2012 - 2025 (2013/05/21)
Intramolecular photoinduced cyclizations are investigated in photoprecursors assembled in a modular fashion via a Diels-Alder reaction of acetylenic dienophiles with subsequent Michael additions of aromatic ketones to install a chromophore capable of initiating Paternò-Büchi cycloadditions or radical cyclization cascades. The protolytic oxametathesis in these systems allows for rapid access to novel polycyclic scaffolds decorated by formyl groups and carboxylates suitable for subsequent modifications. In conformationally constrained photoprecursors, a radical rearrangement takes place resulting in intramolecular 1,3-diradical cyclopentanation of the double bond.
Regioselective preparation of 7-oxanorborna-2,5-diene-2,3-dicarboxylic acid derivatives by the diels-alder reaction: A selective access to furans by retro-diels-alder reaction
Sultan, Nisrine,Guillot, Regis,Blanco, Luis,Deloisy, Sandrine
, p. 2018 - 2028 (2013/07/26)
Hydrolysis of 1-substituted 7-oxanorborna-2,5-diene-2,3-dicarboxylates occurred regioselectively at the ester group in the 3-position to give monocarboxylic acids from which diesters containing two different alkoxy groups and amido esters were selectively
IrCl3 or FeCl3-catalyzed convenient synthesis of 3-hydroxyphthalates
Shinohara, Hiroyuki,Sonoda, Motohiro,Atobe, Shingo,Masuno, Haruna,Ogawa, Akiya
experimental part, p. 6238 - 6241 (2011/12/14)
IrCl3·3H2O or FeCl3-catalyzed convenient synthesis of 3-hydroxyphthalates has been achieved by a Diels-Alder reaction of furans with dimethyl acetylenedicarboxylate, followed by ring-opening aromatization reaction of the D
