Organocatalytic Sequential One-Pot Double Cascade Asymmetric Synthesis of Wieland−Miescher Ketone Analogues from a Knoevenagel/Hydrogenation/Robinson Annulation Sequence: Scope and Applications of Organocatalytic Biomimetic Reductions
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1021/jo070277i
日期:2007.7.1
practical and novel organocatalytic chemo- and enantioselective process for the cascade synthesis of highly substituted 2-alkyl-cyclohexane-1,3-diones and Wieland−Miescher (W−M) ketone analogs is presented via reductive alkylation as a key step. First time, we developed the one-step alkylation of dimedone and 1,3-cyclohexanedione with aldehydes and Hantzsch ester through an organocatalytic reductive alkylation
Nickel nanoparticles: A highly efficient catalyst for one pot synthesis of tetraketones and biscoumarins
作者:JITENDER M. KHURANA、KANIKA VIJ
DOI:10.1007/s12039-012-0275-8
日期:2012.7
nickel nanoparticles have been used as a catalyst for promoting the synthesis of 2,2′-aryl-methylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one), 2,2′-aryl-methylene bis(3-hydroxy-2-cyclohexene-1-one), also known as tetraketones, and biscoumarins via Knoevenagel condensation followed by rapid Michael addition. A novel and highly efficient PVP stabilized Ni nanoparticle catalysed synthesis of tetraketones
Chemoselective Synthesis of 2,2′-Arylmethylene <i>bis</i>-(3-Hydroxy-2-cyclohexenes) (“Tetraketones”) in Hexafluoro-2-propanol
作者:Behrooz Maleki、Massomeh Raei、Elahe Akbarzadeh、Hassan Ghasemnejad-Bosra、Alireza Sedrpoushan、Samaneh Sedigh Ashrafi、Mohammad Nabi Dehdashti
DOI:10.1080/00304948.2016.1127102
日期:2016.1.2
Samaneh Sedigh Ashrafi, and Mohammad Nabi Dehdashti Department of Chemistry, Hakim Sabzevari University, Sabzevar, 9617976487, Iran Young Researchers and Elite Club, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran Department of Chemistry, Babol Branch, Islamic Azad University, Babol, Iran Institute of Industrial Chemistry, Iranian Research Organization for Science and Technology, Tehran
Anion functionalized ionic liquid from artificial sugar: a sustainable pathway for diverse bis-enol derivatives
作者:Himani Sharma、Suman Srivastava
DOI:10.1039/c9nj01899a
日期:——
An artificial sugar saccharine based anion-functionalized ionic liquid [Bmim]Sac was synthesized and used for new and straightforward strategies for the construction of a diverse range of bis-enols.
1,8-Diazabicyclo [5.4.0] undec-7-ene functionalized cellulose nanofibers as an efficient and reusable nanocatalyst for the synthesis of tetraketones in aqueous medium
1,8-Diazabicyclo [5.4.0] undec-7-ene functionalized cellulose nanofibers (CNF@DBU[Cl]) were simply prepared and characterized by analytical techniques. Scanning electron microscope confirmed that CNF@DBU[Cl] was formed with average size of 30–60 nm. X-ray diffraction of CNF@DBU[Cl] showed that the crystalline structure of the cellulose nanofibers was remained unchanged after functionalization. According to elemental analyses and thermal gravimetric analysis, the loading amount of organic group on cellulose nanofibers was found to be 1.46 mmol/g. The catalytic activity of DBU functionalized cellulose nanofibers was studied for the synthesis of biologically important tetraketone derivatives in the reaction of aldehydes with 1,3-dicarbonyl compounds. In the presence of CNF@DBU[Cl], the corresponding tetraketones were obtained in 80–96% yields under very mild reaction conditions. The catalyst was recovered and reused four successive runs without significant loss of catalytic activity. This method showed several significant advantages including short reaction times, high yields of products, use of various substrates, convenient work-up, no necessity of extraction or chromatographic purification steps, environmentally friendly conditions and lack of use of any harmful solvent.