Zirconocene-Mediated Carbonylative Coupling of Grignard Reagents
作者:Melissa Moss、Xinping Han、Joseph M. Ready
DOI:10.1002/anie.201603133
日期:2016.8.16
a benzylic group, or an alkyl group that possesses a tertiary or quaternary carbon atom α to the carbon–zirconium bond can not be formed in this way. To provide more generalized access to acyl zirconium reagents, we explored the transmetalation of Grignard reagents with zirconocene dichloride under a CO atmosphere. This protocol generates acyl zirconium(IV) complexes that are inaccessible with the Schwartz
Catalyst‐Controlled Divergent Generations and Transformations of <i>α</i>‐Carbonyl Cations from Alkynes**
作者:Junrui Zhou、Weilin Wang、Fenfang Zuo、Shupeng Liu、Pathan Mosim Amin、Kangbao Zhong、Ruopeng Bai、Youliang Wang
DOI:10.1002/anie.202302545
日期:2023.12.4
Catalyst-controlled divergent generations of α-carbonyl cations from single alkyne functionalities and their divergent further transformations have been established. Broad spectrum of alkynes including aryl alkyne, ynamide, alkynyl ether, and alkynyl sulfide could be utilized. The intermediacy of α-carbonyl cations via the N−O bond cleavage was supported by DFT calculations in both catalytic systems
Nickel/Photoredox Dual-Catalyzed Conversion of Allyl Esters to Ketones via the Formal Deletion of Oxygen
作者:Ryoma Shimazumi、Riku Tanimoto、Mamoru Tobisu
DOI:10.1021/acs.orglett.3c02606
日期:2023.9.1
We report herein the catalytic conversion of allylic esters into the corresponding ketones by the formal deletion of an oxygen atom. The key to the success of the reaction is the dual use of nickel and photoredox catalysts; the former mediates C–O bond activation and C–C bond formation, while the latter is responsible for deoxygenation of the acyloxy group using PPh3 as a stoichiometric reductant.
Palladium-Catalyzed Oxime Assisted Intramolecular Dioxygenation of Alkenes with 1 atm of Air as the Sole Oxidant
作者:Ming-Kui Zhu、Jun-Feng Zhao、Teck-Peng Loh
DOI:10.1021/ja100716x
日期:2010.5.12
This paper describes a palladium-catalyzed oxime assisted intramolecular dioxygenation of alkenes by using 1 atm of air as the sole oxidant under extremely mild conditions, which demonstrated the feasibility of incorporating atmospheric oxygen into synthetically useful products under 1 atm of air at room temperature.
Accessing novel fluorinated heterocycles with the hypervalent fluoroiodane reagent by solution and mechanochemical synthesis
作者:William Riley、Andrew C. Jones、Kuldip Singh、Duncan L. Browne、Alison M. Stuart
DOI:10.1039/d1cc02587b
日期:——
A new and efficient strategy for the rapid formation of novel fluorinated tetrahydropyridazines and dihydrooxazines has been developed by fluorocyclisation of β,γ-unsaturatedhydrazones and oximes with the fluoroiodane reagent. Mechanochemical synthesis delivered fluorinated tetrahydropyridazines in similar excellent yields to conventional solution synthesis, whereas fluorinated dihydrooxazines were