Silica-supported ceric ammonium nitrate (CAN): a simple, mild and solid-supported reagent for quickest oxidative aromatization of Hantzsch 1,4-dihydropyridines

Superparamagnetic core‐shell metal–organic framework Fe3O4@Ni‐MOF as efficient catalyst for oxidation of 1,4‐dihydropyridines using hydrogen peroxide

“…How to cite this article: M. Janani, M. A. Senejani, T. M. Isfahani, Appl Organomet Chem 2021, 35 (10), e6350. https://doi.org/10.1002/aoc.…”

“…Several reagents and chemicals have been used for the oxidation of DHPs such as NaBrO 3, [5] NaClO 2, [6] V 2 O 5 /SiO 2 nanoparticles, [7] Bi 2 O 3 nanorods, [8] Na 2 S 2 O 4 /TBHP (tert-butylhydroperoxide), [9] and SiO 2 -CAN (ceric ammonium nitrate). [10] In this study, H 2 O 2 and Fe 3 O 4 @Ni-MOF were selected as the oxidant and catalyst, respectively, for oxidation of 1,4-dihydropyridines. Hydrogen peroxide is a cheap and green oxidant for oxidation of a large number of substrates.…”

Oxidation of Some Dihydropyridine Derivatives Via Different Methods

“…Oxidation of dihydropyridines is one of the ubiquitous issues in organic chemistry (Safaiee et al, 2018). In recent years several research groups have reported new oxidation methods which includes oxidation with ferric nitrate on a solid support (Balogh, Hermecz, Ménszáros, & Laszlo, 2004), manganese dioxide or DDQ (Zolfigol, Sadeghi, Mohammadpoor-Baltork, Choghmarani, & Taqian-Nasab, 2001), nitric oxide (Itoh, Nagata, Matsuya, Miyazaki, & Ohsawa, 1997), bismuth nitrate pentahydrate (Mashraqui & Karnik, 1998), PCC (Vanden Eynde, Mayence, & Maquestiau, 1992), tetra kis-pyridine cobalt (II) dichromate (TPCD) (Safaiee et al, 2018), nicotinium dichromate (Loupy, Sansoulet, Díez-Barra, & Carrillo, 1992), N2O4 complex of 18-crown-6 (Zolfigol, Zebarjadian, et al, 2001), MClx/ NaNO2/wet SiO2 (Paul, Sharma, Gupta, Choudhary, & Gupta, 2007), silica chloride/NaNO2/wet SiO2 (Ali Zolfigol, Shirini, Choghamarani, & Mohammadpoor-Baltork, 2003), H2O2 Co(OAc)2 (Zolfigol, Sadeghi, et al, 2001), MCM-41 silica supported HPF6 (Ray, Brown, Bhaumik, Dutta, & Mukhopadhyay, 2013), NaHSO4/Na2Cr2O7/wet SiO2 (Zolfigol, Sadeghi, et al, 2001), peroxy-disulfatecobalt (II), Zr(NO3)4 (Sabitha, Kumar Reddy, Reddy, Fatima, & Yadav, 2003), hypervalent iodine reagents (Son, Truong, Mishra, Mishra, & Kim, 2018), Co(II) catalyzed auto-oxidation (Chavan, Kharul, Kalkote, & Shivakumar, 2003), Silica-supported ceric ammonium nitrate (CAN) (Kumar et al, 2019), Au/TiO2 nanoparticles (Stratakis, Fragkiadakis, Kidonakis, & Zorba, 2020), sodium nitrite or nitrates (Monier, Abdel-Latif, El-Mekabaty, & Elattar, 2019) and heteropolyacid/NaNO2/wet SiO2 (Niknam, Zolfigol, Razavian, & Mohammadpoor-Baltork, 2005). Due to the importance of oxidative derivatives of dihydropydines, here we use three different methods for oxidation of dihydropyrides to synthetize ten derivatives and characterized using EIMS, NMR and CHN.…”

Copper‐Phosphine Supported Fe3O4@SiO2 as a Novel Reusable Nanocatalyst‐Catalyzed Tandem Reaction of Indole and Alcohols to Bis(indolyl)methanes under Blue LED Light

“…The target of science is recently shifted toward preserving environment; thus, catalyst recovery and reusability are important properties in catalytic processes . Homogeneous catalysts have complicated recovery process; therefore, heterogeneous catalysts have been proposed as a primary solution in recovery process of catalysts.…”