Alkene‐Directed
<i>N</i>
‐Attack Chemoselectivity in the Gold‐Catalyzed [2+2+1]‐Annulations of 1,6‐Enynes with
<i>N</i>
‐Hydroxyanilines
作者:Deepak B. Huple、Bhanudas D. Mokar、Rai‐Shung Liu
DOI:10.1002/anie.201507946
日期:2015.12
Kinetically unstable nitrones are generated from gold‐catalyzed reactions of 1,6‐enynes with N‐hydroxyanilines, and subsequently trapped by tethered alkenes to furnish [2+2+1]‐annulations. Our experimental data reveal that such nitrones arise from atypical N‐attack chemoselectivity that is triggered by tethered alkenes to facilitate the key protodeauration reaction.
动力学不稳定的硝酮是由1,6-炔烃与N-羟基苯胺的金催化反应生成的,随后被束缚的链烯捕集以提供[2 + 2 + 1]环。我们的实验数据表明,这种硝酮是由非典型的N攻击化学选择性引起的,该化学选择性是由链状烯烃触发的,以促进关键的原型脱氢反应。