A pseudo multi-component electrochemical synthesis of spiro dihydrofuran derivatives
作者:Changsheng Yao、Ying Wang、Tuanjie Li、Chenxia Yu、Liang Li、Chao Wang
DOI:10.1016/j.tet.2013.10.056
日期:2013.12
An electrochemical strategy to the assembly of tricyclic spiro dihydrofuran scaffold via the reaction of aryl aldehyde and dimedone has been developed successfully. This protocol has the advantages of high yields, wide application scope and an environmental benign procedure compared with the reported methods.
Abstract Iodine–ammonium acetate–mediated annealation of dimedone with aldehydes led to facile formation of spirodihydrofuran in good yields through tandem Knoevenagel–Michael iodonation and cyclodehydroiodonation reactions in a single pot.
The use of supported Cu complex on mesoporous as a novel, efficient, heterogeneous, reusable and green catalyst for the synthesis of spiro‐dihydrofuran derivatives is reported. This methodology is effective for the reaction of dimedone with a wide range of aldehyde in the presence of BrCN and triethylamine. The structure of catalyst was characterized by different techniques such as EDX, SEM, TGA, ICP‐OES
Reaction of 5,5-dimethylcyclohexane-1,3-dione (dimedone), aldehydes and cyanogen bromide in the presence of triethylamine leads to the selective formation of spiro dihydrofurans in moderate to good yields at room temperature.
Reaction of Stabilized Bismuthonium Ylides with Aldehydes. A Novel Reaction Mode of the Heaviest Group V Element Ylide
作者:Takuji Ogawa、Toshihiro Murafuji、Hitomi Suzuki
DOI:10.1246/cl.1988.849
日期:1988.5.5
Stabilized bismuthonium ylides, triphenylbismuthonio-4,4-dimethyl-2,6-dioxocyclohexane-1-ide and triphenylbismuthonio-4,4-dimethyl-2,6-dioxo-3,5-dioxan-1-ide, react with aldehydes to afford three types of products; tetraacylcyclopropanes, dihydrofurans, and α,β-unsaturated carbonyl compounds, the relative importance of these depending greatly on the ylides, aldehydes, and reaction conditions employed.