Evolution of Propargyl Ethers into Allylgold Cations in the Cyclization of Enynes
作者:Eloísa Jiménez-Núñez、Mihai Raducan、Thorsten Lauterbach、Kian Molawi、César R. Solorio、Antonio M. Echavarren
DOI:10.1002/anie.200902248
日期:2009.8.3
Shifty moves: 1,n‐Enynes with propargyl alcohol, ether, or silyl ether units undergo gold(I)‐catalyzed intramolecular 1,(n−1)‐migration via allylgold cations (see scheme). These intermediates have been trapped by olefins, indole, and by a formal intramolecular CH insertion. In the case of aryl‐substituted 1,7‐enynes, a cascade process involving a Nazarov‐type cyclization leads to 6,7‐dihydro‐5H‐benzo[c]fluorenes
变动的动作:1,带有炔丙醇,醚或甲硅烷基醚单元的n-烯炔通过烯丙基阳离子经历金(I)催化的分子内1,(n -1)迁移(参见方案)。这些中间体已被烯烃,吲哚和正规的分子内CH插入所俘获。就芳基取代的1,7-炔而言,涉及纳扎罗夫型环化的级联反应会生成6,7-二氢-5 H-苯并[ c ]芴。