3-Alkenylation or 3-Alkylation of Indole with Propargylic Alcohols: Construction of 3,4-Dihydrocyclopenta[<i>b</i>]indole and 1,4-Dihydrocyclopenta[<i>b</i>]indole in the Presence of Different Catalysts
作者:Li Zhang、Yuanxun Zhu、Guangwei Yin、Ping Lu、Yanguang Wang
DOI:10.1021/jo300339a
日期:2012.11.2
3-alkylation of indole with propargylic alcohols could be efficiently controlled by the catalyst. In the presence of triflic acid, 3-alkenylation of indole occurred and a 3,4-dihydrocyclopenta[b]indole skeleton was effectively constructed in moderate to excellent yields via a cascade process. In the presence of Cu(OTf)2, 3-alkylation of indole resulted in the formation of 3-propargylic indole, which could
催化剂可以有效地控制吲哚与炔丙醇的3-烯基化或3-烷基化。在三氟甲磺酸存在下,吲哚发生3-烯基化反应,并通过级联法以中等至极好的收率有效地构建了3,4-二氢环戊[ b ]吲哚骨架。在铜(OTF)的存在下2,吲哚的3-烷基化导致形成3-丙炔吲哚,其可进一步转化为2-碘-1,4-二氢环戊二烯并[ b ]吲哚在存在Ñ -碘代琥珀酰亚胺和三氟化硼醚化物。与吲哚的3-链烯基化或3-烷基化有关的可能机制,以及它们延伸至3,4-二氢环戊五烯的形成[ b提出并讨论了]吲哚或1,4-二氢环戊[ b ]吲哚。