Modular Synthesis of Bicyclic and Tricyclic (Aza‐) Arenes from Nucleophilic (Aza‐)Arenes with Electrophilic Side Arms via [4+2] Annulation Reactions
作者:Wenbo Huang、Shaomin Chen、Jian Yang、Ahmed El‐Harairy、Xin Wang、Minghao Li、Yanlong Gu
DOI:10.1002/adsc.201900425
日期:2019.9.17
and enolizable ketones or aldehydes as the counterpart reagents. A variety of six‐membered carbocycles and heterocycles, such as indolizines, indoles, naphthalenes, carbazoles, and pyrido[1,2‐α]indoles, were successfully synthesized. Some one‐pot sequential reactions were also developed, in which the 1,4‐donor‐acceptor precursors can be synthesized via oxidation of alcohols or a proper condensation reaction
从具有亲电子侧臂的亲核(氮杂)芳烃合成双环和三环(氮杂)芳烃的有效策略被开发出来。(氮杂)芳烃前体同时具有亲核位点和亲电位点,它们固定在1,4距离处。双环和三环(氮杂)芳烃产品是通过[4 + 2]环化反应制得的,方法是使用三氟甲磺酸scan(III)作为催化剂,可烯化的酮或醛作为相应的试剂。已成功合成了多种六元碳环和杂环,例如吲哚嗪,吲哚,萘,咔唑和吡啶并[1,2-α]吲哚。一些单釜连续反应也得到了发展,其中,所述1,4-供体-受体的前体,可以合成通过 醇氧化或适当的缩合反应。