Jasmonoids with cis-2-pentenyl side chain such as cis-jasmone, methyl jasmonate, and jasmolone were easily synthesized from cis-4-heptenoic acid obtained by the ring opening reaction of β-propiolactone with di-cis-butenylcuprate.
Synthèse de monodioxolannes de dicétones-1,4 et de dicétones-1,4 au moyen des anhydrides mixtes carboxyliques et carboniques: application à la
作者:J.-L. Moreau、R. Couffignal、R. Arois-Chtara
DOI:10.1016/s0040-4020(01)92014-9
日期:1981.1
Levulinic acid 1 is easily converted by two steps into mixed carboxylic and carbonic anhydride 3 which reacts with the organolithium reagent issued from trimethylsilyl esters Monoethylene acetal of 1,4-diketones 4 can be prepared; it is also possible to obtain 1,4-diketones 5 in one step by hot acid hydrolysis. The preparation of the dihydrojasmone 6d, Z-jasmone 6eand dehydrojasmone 6f shows the efficiency
addition of 2-methylcyclopropenyllithium to N-methoxy-N-methylcarboxamides followed by hydrolysis of intermediate cyclopropyl ketone adducts on silica gel. The new method has been applied to the synthesis of cis-jasmone.
(Z)-Jasmone ,dihydrojasmone and other 3-methylcyclo=pent-2-en-1-ones are easily synthesized starting from aldehydes and 1-(2-methyl-1,3-dioxolane-2-yl)-2-nitroethane as reagent for 3-ketobutyl anion synthon. Nitro-aldol condensation is the chainlegthening reaction followed by oxidation and denitration via p-toluenesulfonylhydrazones of the corresponding α-nitroke=tones. Removal of protecting groups
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.