A hydroxyl group was readily and directly introduced into the α-position of a variety of β-dicarbonyl compounds by heterogeneous Pd/C-catalyzed oxygenation using molecular oxygen.
A chemo- and regioselective α-hydroxylationreaction of carbonyl compounds with molecularoxygen as oxidant is reported. The hydroxylation reaction is catalyzed by a dinuclear Pd(II) complex, which functions as an oxygen transfer catalyst, reminiscent of an oxygenase. The development of this oxidation reaction was inspired by discovery and mechanism evaluation of previously unknown Pd(III)-Pd(III)
A Facially Coordinating Tris‐Benzimidazole Ligand for Nonheme Iron Enzyme Models
作者:Parami S. Gunasekera、Preshit C. Abhyankar、Samantha N. MacMillan、David C. Lacy
DOI:10.1002/ejic.202000984
日期:2021.2.19
we report a new tripodal tris‐benzimidazole ligand (Tbim) that structurally mimics the 3‐His coordination environment of certain nonheme mononuclear iron oxygenases. The coordinationchemistry of Tbim was explored with iron(II) revealing a diverse set of coordination modes. The aerobic oxidation of biomimetic model substrate diethyl‐2‐phenylmalonate was studied using the Tbim−Fe and Fe(OTf)2.
To support mechanistic inferences made for an iron-based dioxygenase model, a nickel analogue, i.e. a TpNi-malonate (1) was prepared. 1 proved to represent a rare case of a nickelcomplex reacting with O2 in a controlled manner – mechanistically different from the iron case – and leads to hydroxylation of the malonate.