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NbCl5-promoted the synthesis of 4H-pyrans through multicomponent reaction
(2016-01-01)
Multicomponent reactions between β-ketoesters and benzaldehydes for the synthesis of 4H-pyran derivatives promoted by niobium pentachloride (NbCl5) were carried out, providing good yields and reasonable reaction times under ...
Synthesis of mesoporous Ca-MCM catalysts and their use in suitable multicomponent synthesis of polyfunctionalized pyrans
(Springer, 2016-10)
Mesoporous Ca-MCM catalysts were prepared using a mixture of CaCO3, TEOS, cetyl trimethyl ammonium bromide (CTAB), triethanolamine (TEA), ethanol and H2O. Three catalysts with different CaCO3 contents, M-Ca 1 %, M-Ca 5 % ...
Ternary hydrotalcites in the multicomponent synthesis of 4H-pyrans
(Multidisciplinary Digital Publishing Institute, 2020-01)
Lamellar double hydroxides (LDH) with double divalent cations were synthesized by the co-precipitation method and studied in the multicomponent synthesis of 4H-pyrans. The solids obtained were characterized by X-ray ...
Effect of Furans and a Pyran on Several Quorum Sensing Factors in Ralstonia solanacearum
(OMICS International, 2016-11)
Ralstonia solanacearum race 2 is the causative agent of Bacterial Wilt in bananas, a disease also known as Moko disease. Once this bacterium becomes established within a plant, it causes the death of its host. Currently, ...
BF3·OEt2-Catalyzed Unexpected Stereoselective Formation of 2,4-trans-Diallyl-2-methyl-6-aryltetrahydro-2H-pyrans with Quaternary Stereocenters
(American Chemical Society, 2021-05)
The present manuscript describes a convenient, mild, and highly stereoselective method for the allylation of δ-hydroxy-α,β-unsaturated ketones having a benzylic hydroxyl group at the δ-position using allyltrimethylsilane ...
New application of decaniobate salt as basic solid in the synthesis of 4H-pyrans by microwave assisted multicomponent reactions
(Springer, 2018-09)
This study focuses on the search of new applications of polyoxometalates known as decaniobate ions [Nb10O28]6−. The decaniobates can be used as basic solid catalysts in multicomponent reactions to obtain good yields to ...
Self-Sensitized Photooxygenation of 2H-Pyrans: Characterization of Unexpected Products Assisted by Computed Structural Elucidation and Residual Dipolar Couplings
(American Chemical Society, 2015-08)
The UVA (350 nm) irradiation of an α-pyran in the presence of oxygen led to the unexpected formation of a tetraoxygenated compound whose structure could not be unambiguously determined on the basis of conventional 1H-13C ...