We herein described a selenylative cyclization reaction of enynes by the utilization of diselenides as radical sources. The visible-light irradiation of the reaction mixture enables the generation of the selenium atomradical to trigger the radicaladdition/cyclization/selenation sequences. Both terminal alkyne and internal alkyne derived 1,6-enynes were tested and suitable for the current synthetic
Graphitic Carbon Nitride as a Heterogeneous Photocatalyst for the Hydrophosphorylation and Hydrophosphorylative Cyclization Reactions of Terminal Alkyne and Its Derived Enynes
Heterogeneous graphitic carbon nitride as the photocatalyst for radical hydrophosphorylation and hydrophosphorylative cyclizationreactions were accomplished, providing a new opportunity to access phosphorylated alkene and cyclic products under redox-neutral conditions.
Synthesis of cyclic allyl vinyl ethers using Pt(II)-catalyzed isomerization of oxo-alkynes
作者:Zezhou Wang、Xi Lin、Rudy L. Luck、Garrett Gibbons、Shiyue Fang
DOI:10.1016/j.tet.2009.01.065
日期:2009.3
Several alkynyl epoxides and one alkynyl allyl alcohol were isomerized to cyclic allylvinylethers (3,4-dihydro-2H-1,4-oxazines) using PtCl2 as the catalyst. Three of these allylvinylethers were converted to 2-hydroxymorpholine derivatives by hydrolysis and two were converted to piperidine derivatives by thermal Claisenrearrangement.
使用PtCl 2作为催化剂,将几种炔基环氧化物和一种炔基烯丙醇异构化为环状烯丙基乙烯基醚(3,4-二氢-2 H -1,4-恶嗪)。这些烯丙基乙烯基醚中的三种通过水解转化为2-羟基吗啉衍生物,而两种通过热克莱森重排转化为哌啶衍生物。
Bismuth(III) Chloride Catalyzed Cycloisomerization of Enynes
作者:Zezhou Wang、Shiyue Fang
DOI:10.1002/ejoc.200900819
日期:2009.11
Several simple bismuth(III) salts were screened for the suitability to catalyze the cycloisomerization of enynes. Among them, BiCl3 gave the best results. Under the optimized reaction conditions, eight substrates were studied, and acceptable to excellent isolated yields were obtained. Consistent with data in the literature, electron-deficient alkynes were found to be better substrates for the reaction