Phosphine-Free NNN-Manganese Complex Catalyzed α-Alkylation of Ketones with Primary Alcohols and Friedländer Quinoline Synthesis
作者:Milan K. Barman、Akash Jana、Biplab Maji
DOI:10.1002/adsc.201800380
日期:2018.9.3
a very simple and inexpensive catalytic system based on Earth's abundant transition metalmanganese and on a bench‐stable phosphine‐free NNN‐pincer ligand for an atom‐efficient α‐alkylations of ketones with primary alcohols via hydrogen‐autotransfer C−C bond formation protocol. The precatalyst could be generated in situ and could be activated by using catalyticamount of base under milder conditions
Aldehyde-Catalyzed Transition Metal-Free Dehydrative β<i>-</i>Alkylation of Methyl Carbinols with Alcohols
作者:Qing Xu、Jianhui Chen、Quan Liu
DOI:10.1002/adsc.201200996
日期:2013.3.11
borrowing hydrogen strategy in which alcohols were activated by transition metal‐catalyzed anaerobic dehydrogenation, the direct addition of aldehydes was found to be an effective but simpler way of alcohol activation that can lead to efficient and green aldehyde‐catalyzed transition metal‐free dehydrative C‐alkylation of methyl carbinols with alcohols. Mechanistic studies revealed that the reaction proceeds
Selective Synthesis of Ketones and Chiral Allylic Alcohols from the Addition of Arylboronic Acids to α,β-Unsaturated Aldehydes Mediated by a Transition Metal/Monophosphorus Ligand System
selective synthesis of ketones or chiralallylicalcohols in high yields/enantiomeric excess from the 1,2-addition of arylboronic acids to α,β-unsaturated aldehydes. Notably, isomerization of the chiralallylicalcohols to ketones was suppressed by the Ru-catalyzed/monophosphorus ligand system. The asymmetric catalytic system provides an alternative and efficient method of preparing chiralallylic alcohols
We report a visible-light-induced iron-catalyzed α-alkylation of ketones. The photocatalytic system is based on the single diaminocyclopentadienone iron tricarbonyl complex. Two catalytic intermediates of this complex are able to harvest light, allowing the synthesis of substituted aromatic and aliphatic ketones at room temperature using the borrowing hydrogen strategy in the presence of various substituted
A novel and practical approach to access saturated ketones from unsaturated ketone derivatives via a CS2/t-BuOK system in dimethyl sulfoxide (DMSO) is reported. The in situ generation of xanthate salt through the reaction of carbon disulfide and potassium tert-butoxide is essential to this transformation. Deuterium-labeling experiments demonstrated that DMSO can act as a hydrogen donor.