Gold(I) complexes are the most active catalysts for alkoxy- or hydroxycyclization and for skeletalrearrangement reactions of 1,6-enynes. Intramolecular alkoxycyclizations also proceed efficiently in the presence of gold(I) catalysts. The first examples of the skeletalrearrangement of enynes by the endocyclic cyclization pathway are also documented. Iron(III) is also able to catalyze exo and endo
selectivity of gold‐catalysed cycloisomerization. Cationic linear digold(I) bis(dicyclohexylphosphino) ferrocenes outperform other catalysts in the demanding regioselective cycloisomerization of enyne sulphonamides into cyclohexadienes. Conversely, tetrahedral and trigonal cationic monogold(I) complexes were found incompetent for enyne cycloaddition. We used the two‐coordinate linear electron‐rich Au(I) complex
Missing cyclization pathways and new rearrangements unveiled in the gold(I) and platinum(II)-catalyzed cyclization of 1,6-enynes
作者:Catalina Ferrer、Mihai Raducan、Cristina Nevado、Christelle K. Claverie、Antonio M. Echavarren
DOI:10.1016/j.tet.2007.02.122
日期:2007.7
formed in the 6-endo-dig cyclization may evolve to form seven-membered ring intermediates. This has been achieved for the first time by using highly electrophilic platinum(II) and gold(I) complexes. Gold(I) also triggers a remarkable rearrangement of certain enynes leading to complex cyclic systems. A new cationic platinacycle is described, which catalyzes skeletalrearrangements and other reactions of
在6- end - dig环化反应中形成的环丙基金属卡宾可能会演变成七元环中间体。这是通过使用高度亲电的铂(II)和金(I)配合物首次实现的。金(I)还引发某些烯炔的显着重排,从而导致复杂的循环系统。描述了一种新的阳离子铂环化合物,其在室温下催化骨架重排和烯炔的其他反应。
Rhodium(I)-Catalyzed Cycloisomerization of 1,6-Enynes to Bicyclo[4.1.0]heptenes
作者:Sun Young Kim、Young Keun Chung
DOI:10.1021/jo902273x
日期:2010.2.19
Efficient rhodium(I)-catalyzed cyclopropanation reactions of nitrogen-tethered 1,6-enynes to azabicyclo[4.1.0]heptenes are reported. Moreover, rhodium(I)-catalyzed tandem cycloisomerization and carbonylative [3+3+1] cycloaddition reactions of a cyclopropylenyne have been observed.
A mixed-valence Ru(II)–Ru(III) complex was used to catalyze the skeletal reorganization of 1,6-enynes, leading to the production of 1-vinylcyclopentene derivatives. The reaction proceeded optimally in an atmosphere of O2 or CO. The presence of an alkyl group at the internal olefinic carbon in the starting enyne resulted in an increase in product yield compared to that bearing no substituent on the olefin moiety.