Regioselective Synthesis of Highly Functionalized Furans Through the Ru<sup>II</sup>-Catalyzed [3+2] Cycloaddition of Diazodicarbonyl Compounds
作者:Likai Xia、Yong Rok Lee
DOI:10.1002/ejoc.201402067
日期:2014.6
A novel method for the RuII-catalyzed regioselective synthesis of highly functionalized furans from readily available cyclic and acyclic diazodicarbonyl compounds and terminal alkynes is described. The devised protocol offers a straightforward means to the construction of a variety of diverse furan derivatives through powerful cascade processes, including the formation of ruthenium carbenoid, cyclopropenation
Furylhydroperoxides are accessible by three different methodologies. In the enzymatic approach, lypoxygenase is employed on non lipid-like substrates. Transitionmetalcatalyzedepoxidation of allylic alcohols is strongly dependent on the structure of the involved hydroperoxide.
The reaction of enolates of 1,3-dicarbonyl compounds (1) with 3,4-dibromo-2-butanone (2) afforded hydrofuran derivatives (4) or (5) in the presence of DBU in THF and the reaction was applied to the one-pot synthesis of antitumor naphthofuran natural products (29).
Rhodium(II)‐Catalyzed Reaction of Iodonium Ylides with Electron‐Deficient and Conjugated Alkynes: Efficient Synthesis of Substituted Furans
作者:Yong Rok Lee、Sang Heum Yoon
DOI:10.1080/00397910600631957
日期:2006.6
The rhodium(II)-catalyzed reactions of iodonium ylides with electron-deficient and conjugated alkynes have been examined. These reactions provide a rapid route to the preparation of furan derivatives with a variety of substituents on the furan ring.
Dipolar cycloaddition of cyclic rhodium carbenoids to digonal carbon. Synthesis of isoeuparin
作者:Michael C. Pirrung、Jiancun Zhang、Andrew T. Morehead
DOI:10.1016/s0040-4039(00)73398-3
日期:1994.8
Diazocyclohexanediones undergo dipolar cycloadditions with substituted acetylenes to provide 2-substituted tetrahydrobenzofuran-4-ones and with allenes to provide 2(H)-3-methylenedihydrofuranones.