- A Combined Experimental–Theoretical Study on Diels-Alder Reaction with Bio-Based Furfural: Towards Renewable Aromatics
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The synthesis of relevant renewable aromatics from bio-based furfural derivatives and cheap alkenes is carried out by using a Diels-Alder/aromatization sequence. The prediction and the control of the ortho/meta selectivity in the Diels-Alder step is an important issue to pave the way to a wide range of renewable aromatics, but it remains a challenging task. A combined experimental-theoretical approach reveals that, as a general trend, ortho and meta cycloadducts are the kinetic and thermodynamic products, respectively. The nature of substituents, both on the dienes and dienophiles, significantly impacts the feasibility of the reaction, through a modulation on the nucleo- and electrophilicity of the reagents, as well as the ortho/meta ratio. We show that the ortho/meta selectivity at the reaction equilibrium stems from a subtle interplay between charge interactions, favoring the ortho products, and steric interactions, favoring the meta isomers. This work also points towards a path to optimize the aromatization step.
- van Scodeller,De Oliveira Vigier, Karine,Muller, Eric,Ma, Changru,Guégan, Frédéric,Wischert, Raphael,Jér?me, Fran?ois
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p. 313 - 323
(2020/10/19)
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- Synthesis and structure-activity relationship study of arylsulfonamides as novel potent H5N1 inhibitors
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H5N1 virus, one subtype of highly pathogenic influenza A virus in human infection, has recently received attention due to its unpredictable and high mortality. In this study, a series of arylsulfonamide derivatives were identified as improved H5N1 inhibitors for the influenza treatment by systematic structure-activity relationship investigation. Among them, the most potent H5N1 inhibitor 3h exhibited excellent antiviral activity against H5N1 virus with EC50 value of 0.006 μM and selectivity index 33543.3. Moreover, the molecular docking of 3h with M2 proton channel protein provides practical way for understanding the inhibition of H5N1 with this kind of compounds.
- Yu, Yongshi,Tang, Qi,Xu, Zhichao,Li, Siliang,Jin, Mengyu,Zhao, Zixuan,Dong, Chune,Wu, Shuwen,Zhou, Hai-Bing
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p. 206 - 216
(2018/10/15)
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- Probing Carbocatalytic Activity of Carbon Nanodots for the Synthesis of Biologically Active Dihydro/Spiro/Glyco Quinazolinones and Aza-Michael Adducts
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Herein, we report the fluorescent carbon dots as an effective and recyclable carbocatalyst for the generation of carbon-heteroatom bond leading to quinazolinone derivatives and aza-Michael adducts under mild reaction conditions. The results establish this nanoscale form of carbon as an alternative carbocatalyst for important acid catalyzed organic transformations. The mild surface acidity of carbon dots imparted by -COOH functionality could effectively catalyze the formation of synthetically challenging spiro/glycoquinazolinones under the present reaction conditions.
- Majumdar, Biju,Mandani, Sonam,Bhattacharya, Tamalika,Sarma, Daisy,Sarma, Tridib K.
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p. 2097 - 2106
(2017/02/26)
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- Aryl sulfonamides as selective PDE4 inhibitors
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A series of novel selective phosphodiesterase 4 (PDE4) inhibitors has been developed which displays activity both in vitro and in vivo. These compounds possess good selectivity for the catalytic site of PDE4 over the high affinity Rolipram binding site. In vivo studies demonstrate a reduced propensity to display the emetic side effects which are commonly observed with PDE4 inhibitors.
- Montana, John G.,Buckley, George M.,Cooper, Nicola,Dyke, Hazel J.,Gowers, Lewis,Gregory, Joanna P.,Hellewell, Paul G.,Kendall, Hannah J.,Lowe, Christopher,Maxey, Robert,Miotla, Jadwiga,Naylor, Robert J.,Runcie, Karen A.,Tuladhar, Bishwa,Warneck, Julie B. H.
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p. 2635 - 2640
(2007/10/03)
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