Study of the Oxidative Cleavage Proposed in the Biogenesis of Transtaganolides/Basiliolides: Pyran-2-one Aromaticity-Mediated Regioselective Control and Biogenetic Implications
作者:José María Álvarez、Zacarías D. Jorge、Guillermo M. Massanet
DOI:10.1002/ejoc.201901894
日期:2020.3.22
synthetic feasibility of the oxidativecleavageproposed in the biogenesis of transtaganolides/basiliolides is studied. The pyran‐2‐one cycle aromaticity controls the oxidativecleavage toward undesired positions in assays with coumarins. The use of a caffeate model has overcome this problem, and has allowed the synthesis of an analogue of the pyran‐2‐one key in the biogenesis.
pH-metric titration studies in methanol disclose that the ligand in [Fe(HL)(DBC)]+ is protonated. The [Fe(L)(DBC)] adducts of iron(III) complexes of bis(pyridyl)-based ligands (1,2) afford higher amounts of intradiol-cleavage products, whereas those of mono/bis(imidazole)-based ligands (4,5) yield mainly the auto-oxidation product benzoquinone. It is remarkable that the adducts [Fe(HL)(DBC)]+/[Fe(HL3)(DBC)X]
Rhodium(I)-Catalyzed Decarbonylative Aerobic Oxidation of Cyclic α-Diketones: A Regioselective Single Carbon Extrusion Strategy
作者:Gangadhararao Golime、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.7b03837
日期:2018.2.16
rhodium-catalyzed decarbonylative aerobic oxidation of cyclic α-diketones has been developed for the first time, where the regioselective formations of α-pyrones and isocoumarins have been achieved. The current decarbonylative aerobic oxidation pathway proceeds via the C–C bond cleavage followed by a C–O bond formation, representing a biomimetic oxidation approach to unsaturated six-membered cyclic
Effective oxygenation of 3,5-di-t-butylpyrocatechol catalysed by vanadium(III or IV) complexes
作者:Yoshitaka Tatsuno、Masanobu Tatsuda、Sei Otsuka
DOI:10.1039/c39820001100
日期:——
Oxygenation of 3,5-di-t-butylpyrocatechol (1) to the corresponding muconic acid anhydride (2) and 2-pyrone (3) is efficiently catalysed by vanadium(III or IV) complexes.
Synthesis and characterization of an iron(III) complex of an ethylenediamine derivative of an aminophenol ligand in relevance to catechol dioxygenase active site
作者:Elham Safaei、Narges Naghdi、Zvonko Jagličić、Andrej Pevec、Yong-Ill Lee
DOI:10.1016/j.poly.2016.10.034
日期:2017.1
high spin iron(III) complex. It shows weak antiferromagnetic interactions through N H⋯Cl intermolecular interactions. The ligand-centered electrochemical oxidation of this complex, due to the oxidation of phenolate group to phenoxyl radicals, as well as the electrochemical metal-centered reduction of the ferric ion to the ferrous ion were investigated. In addition, the efficient cleavage by oxygenation