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。
New Annulations via Platinum-Catalyzed Enyne Cyclization and Cyclopropane Cleavage
作者:Cristina Nevado、Catalina Ferrer、Antonio M. Echavarren
DOI:10.1021/ol0486573
日期:2004.9.1
[reaction: see text] Oxidative ringopening of 3-oxabicyclo[4.1.0]hept-4-enes, formed by the intramolecular Pt(II)-catalyzed cyclopropanation of enol ethers by alkynes, gives oxepane derivatives. Alternatively, the acid-catalyzedopening of the cyclopropane ring leads to dihydrobenzofurans or 3,4-dihydro-2H-chromenes.