Acylstannanes were found to add to such alpha,beta-unsaturated carbonylcompounds as enones or ynoates in the presence of a nicel or palladium catalyst to give 2-stannyl-4-oxoalk-2-enoates or 1,4-diketones, whereas the three component coupling between acylstannanes, enones and aldehydes provided 2-hydroxymethyl 1,4-diketones.
A variety of ketones have been prepared by a palladium-catalyzed reaction of ethanethiol esters with organozinc reagents. Various functional groups, including esters, ketones, aromatic halides and aldehydes, tolerate the reaction conditions. The reaction can also be applied to the synthesis of α-amino ketones using the corresponding L-α-amino thiol esters without racemization.
A New Simple Synthesis of Aryl-Substituted 1,4-Diketones
作者:Alexander V. Kel’in、Oleg G. Kulinkovich
DOI:10.1055/s-1996-4215
日期:1996.3
1,4-Diketones have been prepared by aldol condensation of methyl ketones with α-bromo ketones in the presence of tert-butoxymagnesium or diethylamido magnesium bromide and subsequent rearrangement of the formed 4-bromo-3-hydroxy ketones under the action of triethylamine.
Synthesis of Diketones, Ketoesters, and Tetraketones by Electrochemical Oxidative Decarboxylation of Malonic Acid Derivatives: Application to the Synthesis of <i>cis</i>-Jasmone
作者:Xiaofeng Ma、Damien F. Dewez、Le Du、Xiya Luo、István E. Markó、Kevin Lam
DOI:10.1021/acs.joc.8b01994
日期:2018.10.5
Disubstituted malonicacidderivatives are smoothly converted into diketones and ketoesters in good to excellent yield (68% to 91%) under electrochemical conditions. The scope can be extended to transform trisubstituted bis-malonic acids into tetraketones in 77% to 86% yield. The new method was applied to the total synthesis of cis-jasmone.
Both 1,3- and 1,4-diketones are obtained from common precursors, β-methoxy-γ-phenylthio ketones. These compounds are derived through the novel phenylthio migration reaction of the aldehyde adducts with methoxy(phenylthio)-methane upon exposure to enol silyl ethers. The compounds thus obtained are converted into 1,3- and 1,4-diketones.