From allylic alcohols to saturated carbonyls using Fe(CO)5 as catalyst: scope and limitation studies and preparation of two perfume components
作者:Hassan Cherkaoui、Mohammed Soufiaoui、René Grée
DOI:10.1016/s0040-4020(01)00114-4
日期:2001.3
The direct conversion of allylicalcohols to saturated carbonyls, using Fe(CO)5 as a catalyst, offers good synthetic potential. Mono-, di- and even trisubstituted alkenes bearing various alkyl, aryl and electronwithdrawing groups on the allylic system give good to excellent yields of rearranged products. Limitations occur mainly with polyunsaturated derivatives. This reaction was applied to a short
Stetter Reaction in Room Temperature Ionic Liquids and Application to the Synthesis of Haloperidol
作者:Siddam Anjaiah、Srivari Chandrasekhar、René Grée
DOI:10.1002/adsc.200404123
日期:2004.9
Imidazolium-type roomtemperatureionic liquids (RTILs) have been used for the Stetter reaction, affording the desired 1,4-dicarbonyl compounds in good yields. Thiazolium salts and Et3N are efficient catalysts for this reaction performed in ionic liquid. The possibility to recycle and reuse the solvent has been demonstrated, although it was not possible to recycle the thiazolium catalyst. This method
complexes 2, which undergo loss of the metal fragment at room temperature to form 1,2-diketones 3, 1,2-hydroxy ketones 4, or dimers 5 through a dimerization or decarbonylation-dimerization process of acyl radicals. Decomposition of 2 in the presence of electron-deficient alkenes 11 and 18 furnishes the two-, three-, and four-component coupling products 12, 13, 19, 20, and 21.
Michael additions of hydrazones for carbon–carbon bond formation
作者:Jack E. Baldwin、Robert M. Adlington、Jeffrey C. Bottaro、Ashok U. Jain、Jayant N. Kolhe、Matthew W. D. Perry、Ian M. Newington
DOI:10.1039/c39840001095
日期:——
The lithium salts of t-butyl-and trityl-hydrazones react with methyl crotonate to form C-trapped azo-esters and similar products were observed from a thermal ene-reaction of aldehyde t-butylhydrazones with methyl acrylate or acrylonitrile, and aldehyde phenylhydrazones with methyl acrylate; these products can be diverted into synthetically useful γ-keto-esters, γ-keto-nitriles, saturated esters, γ