Application of Host–Guest Complexation Method to Isolation of Natural Product
作者:Mari Segawa、Koji Mori、Fumio Toda
DOI:10.1246/cl.1988.1755
日期:1988.10.5
Application of host–guest complexation method to isolation of caffeine, nicotine, and cholesterol from tea and tabaco leaves, and gallstone, respectively, has been reported. Separations of strychnine and brucine, and sparteine and brucine by the same method were also reported.
Silver-Catalyzed Cross-Coupling of Propargylic Alcohols with Isocyanides: An Atom-Economical Synthesis of 2,3-Allenamides
作者:Jianquan Liu、Zhenhua Liu、Nannan Wu、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201304255
日期:2014.2.17
Cross‐coupling reactions between propargylicalcohols and isocyanides, by means of silver catalysis, have been described. This new reaction is both atom and step efficient and is applicable to a broad scope of substrates, allowing the synthesis of a range of synthetically valuable 2,3‐allenamides in moderate to excellent yields.
Metal‐Free Synthesis of (
<i>E</i>
)‐Vinyl Sulfones
<i>via</i>
An Insertion of Sulfur Dioxide/1,5‐Hydrogen Atom Transfer Sequence
作者:Fu‐Sheng He、Yanfang Yao、Wenlin Xie、Jie Wu
DOI:10.1002/adsc.202000778
日期:2020.11.4
A metal‐free three‐component reaction of propargyl alcohols, sodium metabisulfite, and aryldiazonium tetrafluoroborates under mild conditions is described. The reaction proceeds efficiently at room temperature without the need of any catalysts, affording the corresponding (E)‐vinyl sulfones in moderate to good yields with excellent functional group tolerance. Preliminary mechanistic studies show that
Regioselective introduction of vinyl trifluoromethylthioether to remote unactivated C(sp3)—H bonds via radical translocation cascade
作者:Shuo Wu、Xinxin Wu、Zhen Wu、Chen Zhu
DOI:10.1007/s11426-019-9527-5
日期:2019.11
the regioselective introduction of a vinyl trifluoromethylthioether to remote unactivatedC(sp3)—Hbonds. The cascade process involves the vinyl radical-mediated 1,5-hydrogen atom transfer (HAT) and remote vinyl migration. During the transformation, inert C—H and C—Cbonds are consecutively cleaved undermildconditions. The reaction features good functional group tolerance, broad substrate scope,
An electrondonor–acceptor (EDA) complex photoactivation strategy for radicalfluorosulfonylation is disclosed for the first time. Simply upon blue light irradiation, the FSO2 radical can be generated efficiently under catalyst-free, base-free, and additive-free conditions, which enables facile access to 6-keto alkenylsulfonyl fluorides from readily available propargyl alcohols and FSO2Cl. The 6-keto