Preparation of a zeolite X-encapsulated copper(ii) chloride complex and its catalysis for liquid-phase oxygenation of enamines in the presence of molecular oxygen
Copper(II) chloride complexes were readily prepared within pores of zeolite X with the modified zeolite found to act as a heterogeneous catalyst for the oxygenation of a variety of enamines in the presence of molecularoxygen without leaching of the active copper species.
氯化铜 (II) 络合物很容易在沸石 X 的孔内制备,改性沸石被发现可作为多相催化剂,用于在分子氧存在下氧化各种烯胺,而不会浸出活性铜物质。
Enamine oxidations. 2. Selective oxidative cleavage of β,β - disubstituted enamines using alumina supported permanganate. Synthesis of one-carbon dehomologated carbonyl compounds from enamines
作者:Clifford E. Harris、William Chrisman、Sally A. Bickford、Lawrence Y. Lee、Antonia E. Torreblanca、Bakthan Singaram
DOI:10.1016/s0040-4039(96)02504-x
日期:1997.2
selective oxidative cleavage reaction which produces ketones and formamides. The ketones can be isolated in high yield and purity by a simple workup procedure. The oxidizing agent is selective and preferentially oxidizes an enamine carbon-carbon double bond in the presence of a distal carbon-carbon double bond. Other functional groups unaffected by this reagent include nitriles, secondary alcohols, and
Zeolite supported permanganate: An efficient catalyst for selective oxidation of enamines, alkylarenes and unsaturated alcohols
作者:R. Sreekumar、Raghavakaimal Padmakumar
DOI:10.1016/s0040-4039(97)01096-4
日期:1997.7
supported on zeolite can be used for the selective oxidation of various enamines, alkylarenes and unsaturatedalcohols to the corresponding ketones, in good yield. Arenes were selectively oxidized at the benzylic position. If the benzylic carbon is secondary, ketones are obtained, and alcohols are produced if the benzylic position is tertiary. In contrast unsaturated secondary alcohols selectively undergo
Simultaneously Electrogenerated Cycloaddition Partners for Regiospecific Inverse-Electron-Demand Diels−Alder Reactions: A Route for Polyfunctionalized 1,4-Benzoxazine Derivatives
2-alkylamino-1,4-benzoxazine derivatives is described. The reactions are regiospecific and diastereospecific in the case of heterocyclic annulation. This cascade sequence, wherein both cycloaddition partners are generated in situ, at room temperature, undermetal-freeconditions, allows the inverse-electron-demand Diels−Alder reaction of an o-iminoquinone diene and a secondary alkylenamine dienophile, two
The tandem oxidation–inverse electron demand Diels–Alder reaction of o-aminophenol derivatives and enamines has been accomplished at room temperature using a stoichiometric amount of manganese dioxide as the oxidant to furnish highly substituted 1,4-benzoxazine cycloadducts with complete regiochemical control. Because of its efficiency in introducing diverse elements in both cycloaddition partners