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
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。
A new palladium catalyst for intramolecular carbametalations of enynes