N-Heterocyclic Carbene-Catalyzed Umpolung Formal [3+3] Cycloaddition of Enals with Isatogens: Access to Fused Indolin-3-ones with a Tetrasubstituted Carbon Stereocenter
作者:Junyu Xu、Shihe Hu、Yingyan Lu、Ying Dong、Weifang Tang、Tao Lu、Ding Du
DOI:10.1002/adsc.201401070
日期:2015.3.23
A novel synthetic method to accessfused indolin‐3‐ones with a tetrasubstitutedcarbonstereocenter has been developed via NHC‐catalyzed umpolungformal [3+3] cycloaddtion of enals with isatogens. This methodology could be also applied for the quick construction of the 6‐5‐5 tricyclic pyrrolo[1,2‐a]indole skeleton which is frequently found as a core structure of many indole alkaloids.
synergistic catalytic strategy has addressed the great challenge in Mn(I)-catalyzed enantioselective C−C bond coupling. A variety of structurally diverse skipped 1,4-dienes are furnished in synthetically useful yields and good enantioselectivity. This strategy has also been applied for the totalsynthesis of the analogues of (−)-Blepharocalyxin D.
协同催化策略解决了 Mn(I) 催化的对映选择性 C−C 键偶联的巨大挑战。提供了多种结构多样的跳过 1,4-二烯,具有合成上有用的产率和良好的对映选择性。该策略也已应用于 (−)-Blepharocalyxin D 类似物的全合成。