W(CO)5(L)-catalyzed 6-endo-selective cyclization and formal Cope rearrangement of allenyl silyl enol ethers
作者:Tomoya Miura、Koichi Kiyota、Hiroyuki Kusama、Nobuharu Iwasawa
DOI:10.1016/j.jorganchem.2006.08.037
日期:2007.1
a catalytic amount of W(CO)6 under photoirradiation, two types of synthetically useful compounds, that is, 6-endo-cyclized products or formal Cope rearrangement products, are obtained selectively via the same intermediates simply by changing reaction conditions. In these reactions, electrophilic activation of the allene moiety is effectively achieved by coordination of W(CO)5, allowing intramolecular
在治疗的5-甲硅烷氧基-1,2,5-三烯与W(CO)催化量6下光照射,两种类型的合成有用的化合物,即,6-内-cyclized产品或正式Cope重排产品,是只需改变反应条件,就可以通过相同的中间体选择性地获得。在这些反应中,通过W(CO)5的配位可有效地实现丙二烯部分的亲电子活化,从而允许中性碳亲核体以6-内切的方式进行分子内攻击。