A new synthetic route for 1,2-diketo compounds using unexpected C–C bond cleavage by PCC
摘要:
An efficient method has been established for the preparation of 1,2-diketones by unexpected C-C bond cleavage in 4-keto-2-hydroxy esters using pyridiniumchlorochromate (PCC). (c) 2012 Elsevier Ltd. All rights reserved.
A conceptual method for the preparation of 1,2-diketones is reported. The selective C–C bond cleavage of 1,3-diketones affords the 1,2-diketones in high yields under mild reaction conditions in air by the use of FeCl3 as the catalyst and tert-butyl nitrite (TBN) as the oxidant without the use of solvent. The possible reaction mechanism is discussed. This protocol provides an expeditious route to the
Ruthenium/dendrimer complex immobilized on silica‐functionalized magnetite nanoparticles catalyzed oxidation of stilbenes to benzil derivatives at room temperature
A new ruthenium/dendrimer complex stabilized on the surface of silica‐functionalized nano‐magnetite was fabricated and well characterized. The nano‐catalyst showed good activity in the synthesis of benzil derivatives via the oxidation of stilbenes with high turnover frequency (TOF) at roomtemperature. Moreover, the catalyst could also be reused up to fifteen times without any loss of its activity
Enantioselective Aerobic Oxidation of α-Hydroxy-Ketones Catalyzed by Oxidovanadium(V) Methoxides Bearing Chiral, <i>N</i>-Salicylidene-<i>tert</i>-butylglycinates
作者:Chien-Tien Chen、Jun-Qi Kao、Santosh B. Salunke、Ya-Hui Lin
DOI:10.1021/ol1024053
日期:2011.1.7
Chiral oxidovanadium(V) methoxides prepared from 3,5-disubstituted-N-salicylidene-l-tert-butylglycines and vanadyl sulfate in air-saturated MeOH serve as highly enantioselective catalysts for asymmetric aerobic oxidations and kinetic resolution of alkyl, aryl, and heteroaryl α-hydroxy-ketones with differed α-substituents at ambient temperature in toluene or TBME (tert-butyl methyl ether). The best