A Brønstedacid‐catalyzed annulation strategy has been developed to construct indeno[1,2‐c]quinolines. This tandem synthetic method proceeds through a sequential electrophilic addition followed by a Friedel–Crafts‐type reaction. A variety of tetracyclic compounds was obtained in moderate to high yields under mild reaction conditions in a short time.
已经开发出一种布伦斯台德酸催化环化策略来构建茚并[1,2- c ]喹啉。这种串联合成方法是通过依次进行亲电加成,然后进行Friedel-Crafts型反应来进行的。在短时间内在温和的反应条件下以中等至高收率获得了各种四环化合物。
Transition-Metal Controlled Diastereodivergent Radical Cyclization/Azidation Cascade of 1,7-Enynes
作者:Yingying Zhao、Yancheng Hu、Haolong Wang、Xincheng Li、Boshun Wan
DOI:10.1021/acs.joc.6b00655
日期:2016.5.20
M–N3 complex to alkyl radicals. Following this concept, the diastereoselectivity has been switched by modulating the transition metals and the ligands. The Mn(III)-mediated radical cyclization/azidation cascade of 1,7-enynes afforded trans-fused pyrrolo[3,4-c]quinolinones, whereas the Cu(II)/bipyridine system gave cis-products.
已经开发了一种实现en烯非对映异构叠氮化的策略,它采用了从M–N 3络合物到烷基自由基的叠氮化物转移。遵循这个概念,通过调节过渡金属和配体来改变非对映选择性。Mn(III)介导的1,7-烯炔的自由基环化/叠氮化级联反应提供了反式稠合的吡咯并[3,4- c ]喹啉酮,而Cu(II)/联吡啶系统则提供了顺式产物。
A concise approach for the synthesis of 3-iodoindoles and 3-iodobenzo[b]furans via Ph3P-catalyzed iodocyclization
作者:Yin-Long Li、Jian Li、Sheng-Nan Yu、Ji-Bo Wang、Yan-Min Yu、Jun Deng
DOI:10.1016/j.tet.2015.09.005
日期:2015.10
A variety of 3-iodoindole and 3-iodobenzo[b]furan derivatives were conveniently prepared from the corresponding 2-alkynylanilines and 2-alkynylphenols through Ph3P-catalyzed iodocyclization in the presence of N-iodosuccinimide (NIS). This protocol provides a rapid access to 3-iodoindoles and 3-iodobenzo[b]furans in good to excellent yields under mild conditions.
Rhodium(III)-Catalyzed Oxidative Allylic C–H Indolylation via Nucleophilic Cyclization
作者:Jiaqiong Sun、Kuan Wang、Peiyuan Wang、Guangfan Zheng、Xingwei Li
DOI:10.1021/acs.orglett.9b01553
日期:2019.6.21
Reported herein is a mild synthesis of 3-allylindoles via Rh(III)-catalyzed allylic C–H activation of olefins and coupling with o-alkynylanilines. The reaction proceeded via initial nucleophilic cyclization of o-alkynylanilines followed by oxidative coupling with allylic C–H bonds via an η3-allyl intermediate.
Rhodium(III)-Catalyzed Cascade Cyclization/Electrophilic Amidation for the Synthesis of 3-Amidoindoles and 3-Amidofurans
作者:Zhiyong Hu、Xiaofeng Tong、Guixia Liu
DOI:10.1021/acs.orglett.6b00689
日期:2016.5.6
A rhodium(III)-catalyzed cascade cyclization/electrophilic amidation using N-pivaloyloxylamides as the electrophilic nitrogen source has been developed. This protocol provides an efficient route for the synthesis of 3-amidoindoles and 3-amidofurans under mild conditions with good functional group tolerance. The synthetic utility of this reaction has been demonstrated through the derivatization of the