The reactions of trichloromethanesulfonyl chloride with trimethylsilyl enol ethers of acetophenones in the presence of a ruthenium(II) phosphine complex gave 1-aryl-3,3-dichloropropen-1-one together with α-chloroacetophenones. The product ratio depended on the substituent on the aromatic ring of the silyl enol ether. The reactions of carbon tetrachloride with the silyl enol ethers under similar conditions
Functionalized β,β-dichloroenones and β,β-dibromoenones as versatile building blocks: Synthesis and transformations
作者:Dengke Li
DOI:10.1016/j.tetlet.2021.153551
日期:2021.12
functionalized β,β-dichloroenones and β,β-dibromoenones was achieved via the Fe-catalyzed radical induced reactionbetween silyl enol ethers and carbontetrachloride, bromotrichloromethane or carbon tetrabromide in moderate to good yields. This reaction proceeds through addition of the trichloromethyl or tribromomethyl radical group to the CC bond of the silyl enol ethers and subsequent base-induced elimination
通过甲硅烷基烯醇醚与四氯化碳、溴三氯甲烷或四溴化碳之间的 Fe 催化自由基诱导反应,以中等至良好的收率实现了功能化β,β-二氯烯酮和β,β-二溴烯酮的高效一步合成。该反应通过将三氯甲基或三溴甲基自由基添加到甲硅烷基烯醇醚的 C C 键上并随后在温和条件下进行碱诱导消除来进行。
Photocatalyst-free visible light driven synthesis of <i>gem</i>-dihaloenones from alkynes, tetrahalomethanes and water
作者:Fuqing Zhang、Zixiang Wei、Wei Wu、Na Liu、Xinhan Li、Luqian Zou、Kaiming Wang、Jianbin Xu、Baomin Fan
DOI:10.1039/d2ob01983c
日期:——
A photocatalyst-free, simple and green method for visible light driven photocatalytic synthesis of gem-dihaloenones from alkynes, tetrahalomethanes and water has been developed.
BrCCl3 and CBr4 was develop, enabling Kharasch-type addition/nucleophilic substitution cascade to selectively produce α-gem-dihalovinyl ketones and chromen-2-ones with moderate to good yields. Use of monoalkynes without additional nucleophilic sites furnished α-gem-dihalovinyl ketonesthrough a Kharasch-type addition and intermolecular allylic substitution cascade whereas the latter transformation of 2-ethynylphenols
A Regioselective Synthesis of 5-chloro-1-vinyl- and 3-alkenyl-5-chloro-1H-pyrazoles
作者:Valentina А. Kobelevskaya、Ludmila I. Larina、Alexandr V. Popov
DOI:10.1007/s10593-022-03139-x
日期:2022.11
5-Chloro-1-vinyl-1Н-pyrazoles were obtained by elimination of hydrogen chloride from the corresponding 5-chloro-1-(2-chloroethyl)-1Н-pyrazoles by the action of NaOH in EtOH or t-BuOK in pyridine. The synthesis of 5-chloro-3-propyl-1-vinyl-1H-pyrazole-4-carbaldehyde was carried out by the treatment of 5-chloro-1-(2-chloroethyl)-3-propyl-1H-pyrazole-4-carbaldehyde with t-BuOK in pyridine. 3-Alkenyl-5-chl