Synthesis of Nine-Membered Carbocycles by the [4+3+2] Cycloaddition Reaction of Ethyl Cyclopropylideneacetate and Dienynes
作者:Shinichi Saito、Kyotaro Maeda、Ryu Yamasaki、Takuya Kitamura、Minami Nakagawa、Korehito Kato、Isao Azumaya、Hyuma Masu
DOI:10.1002/anie.200907052
日期:2010.3.1
Various dienynes reacted efficiently with ethyl cyclopropylideneacetate in the presence of [Ni(cod)2]/PPh3, and cyclononadienes were synthesized in a selective manner. Dienynes tethered with aromatic rings were very good substrates, and the corresponding tricyclic compounds were isolated in high yields. The reaction provides a new route for the synthesis of nine‐membered carbocycles (see scheme).
Au(PPh3)OPOF2-catalyzed intramolecular [4+2] cycloaddition reaction of dienynes
作者:Soo Min Kim、Ji Hoon Park、Young Keun Chung
DOI:10.1039/c1cc11127b
日期:——
Solvolysis of Au(PPh(3))PF(6) afforded Au(PPh(3))OPOF(2) which is an effective catalyst in the intramolecular [4+2] cycloaddition of unactivated dienynes bearing a terminal alkyne.