Reactions of<i>o</i>-quinones with α-methyl- (or methylene) substituted phosphorus ylides. Synthesis of benzo[<i>b</i>]furan derivatives
作者:Daman R. Gautam、Konstantinos E. Litinas、Konstantina C. Fylaktakidou、Demetrios N. Nicolaides
DOI:10.1002/jhet.5570400301
日期:2003.5
In Wittig reaction of some α-methyl- and α-methylene-substituted phosphorus ylides with o-quinones, benzo[b]furan derivatives were obtained via the cyclization of the o-vinylphenols, initially formed from the tautomerization of the corresponding intermediate o-quinone methides.
在一些α-甲基和α-亚甲基取代的磷酰化物与邻醌的维蒂希反应中,通过邻乙烯基苯酚的环化反应获得了苯并[ b ]呋喃衍生物,该衍生物最初是由相应中间体邻-的互变异构形成的。醌甲基化物。
FeCl<sub>3</sub>-catalyzed dimerization/elimination of 1,1-diarylalkenes: efficient synthesis of functionalized 4<i>H</i>-chromenes
作者:Chao Ma、Yu Zhao
DOI:10.1039/c7ob02941a
日期:——
An efficientsynthesis of valuable poly-substituted 4H-chromenes was developed via a [4 + 2] cycloaddition followed by the elimination of 1,1-diarylalkenes. The inexpensive FeCl3 salt has proven to be an efficient catalyst for this transformation. The commercial availability of the catalyst and reagents, together with a convenient procedure, makes this an attractive method for 4H-chromene synthesis
Organocatalytic Asymmetric Synthesis of 1,1-Diarylethanes by Transfer Hydrogenation
作者:Zhaobin Wang、Fujin Ai、Zheng Wang、Wanxiang Zhao、Guangyu Zhu、Zhenyang Lin、Jianwei Sun
DOI:10.1021/ja510980d
日期:2015.1.14
organocatalytic transferhydrogenation strategy for the asymmetric synthesis of 1,1-diarylethanes is described. Under mild conditions, a range of 1,1-diarylethanes substituted with an o-hydroxyphenyl or indole unit could be obtained with excellent efficiency and enantioselectivity. We also extended the protocol to an unprecedented asymmetric hydroarylation of 1,1-diarylalkenes with indoles for the synthesis of