New convenient syntheses of two 3(2H)-furanone natural products bullatenone (1) and geiparvarin (2) are described involving the hydration of the corresponding readily accessible acetylenic ketones. These are best made by a Pd (II) - Cu (I) catalysed coupling process.
Building Congested Ketone: Substituted Hantzsch Ester and Nitrile as Alkylation Reagents in Photoredox Catalysis
作者:Wenxin Chen、Zheng Liu、Jiaqi Tian、Jin Li、Jing Ma、Xu Cheng、Guigen Li
DOI:10.1021/jacs.6b06379
日期:2016.9.28
For the first time, 4-alkyl Hantzsch esters were used to construct molecules with all-carbon quaternary centers by visible light-induced photoredox catalysis via transfer alkylation. Up to a 1500 h(-1) turnover frequency was achieved in this reaction. Reactions of 4-alkyl Hantzsch nitriles as tertiary radical donors joined two contiguous all-carbon quaternary centers intermolecularly, and this chemistry
Kotschetkow, Zhurnal Obshchei Khimii, 1953, vol. 23, p. 760,762; engl. Ausg. S. 795, 797
作者:Kotschetkow
DOI:——
日期:——
Functional group hybrids. Reactivity of .alpha.'-nucleofuge .alpha.,.beta.-unsaturated ketones. 2. Reactions with malonate anion. Concerning the mechanism of the Favorskii rearrangement
作者:Thomas R. Barbee、Hedeel Guy、Mary Jane Heeg、Kim F. Albizati
DOI:10.1021/jo00024a015
日期:1991.11
The scope and limiations of the reaction of alpha'-nucleofuge alpha,beta-unsaturated ketones with sodium dimethyl malonate has been studied systematically. The substrates with good nucleofuges (halides, mesylate) give cyclopropanols upon reaction with malonate anion by way of a conjugate Favorskii reaction. In reactions with substrates containing the poorer nucleofuge (acetoxy) conjugate addition proceeded without entering the Favorskii manifold. Concerning the mechanism of the Favorskii reaction, it is suggested that the loss of the nucleofuge occurs to give a 2-oxyallyl cation, but that disrotatory ring closure is facile and the only products observed result from nucleophilic trapping of cyclopropanones to yield cyclopropanols in fair to good yield.
Jackson, Richard F. W.; Raphael, Ralph A., Journal of the Chemical Society. Perkin transactions I, 1984, # 3, p. 535 - 539