Photocatalytic Decarboxylative [2 + 2 + <i>m</i>] Cyclization of 1,7-Enynes Mediated by Tricyclohexylphosphine and Potassium Iodide
作者:Hui-Yuan Liu、Yuan Lu、Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.0c03182
日期:2020.11.20
photocatalytic decarboxylative [2 + 2 + m] cyclization of 1,7-enynes with alkyl N-hydroxyphthalimide (NHP) esters, using tricyclohexylphosphine and potassium iodide as redox catalysts, is reported for the construction of functional polycyclic compounds. This protocol tolerates primary, secondary, and tertiary alkyl NHP esters through a single reaction via decarbonylation, radical addition, C–H functionalization
据报道,使用三环己基膦和碘化钾作为氧化还原催化剂,用烷基N-羟基邻苯二甲酰亚胺(NHP)酯进行的1,7-烯炔的新型光催化脱羧[2 + 2 + m ]环化反应。该方案通过脱羰,自由基加成,CH-H官能化和在温和条件下环化的单一反应,可以耐受伯,仲和叔烷基NHP酯。
Metal-Free Annulation Cascades of 1,7-Enynes Using Di-<i>tert</i>
-butyl Peroxide as the Methyl Source towards the Synthesis of Polyheterocyclic Scaffolds
作者:Fang-Lin Tan、Ming Hu、Ren-Jie Song、Jin-Heng Li
DOI:10.1002/adsc.201700699
日期:2017.10.25
construct methylated polyheterocyclic scaffold skeletons is described. In this transformation, three new C–C bonds and two new rings are formed. Notably, di-tert-butyl peroxide (DTBP) acts not only as a radical initiator but also as an efficient methyl source.
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。
Cascade Reactions Assisted by Microwave Irradiation: Ultrafast Construction of 2-Quinolinone-Fused γ-Lactones from <i>N</i>-(<i>o</i>-Ethynylaryl)acrylamides and Formamide
作者:Bruce A. L. Sacchelli、Bianca C. Rocha、Leandro H. Andrade
DOI:10.1021/acs.orglett.1c01606
日期:2021.7.2
methodology to construct novel highly functionalized 2-quinolinones from N-(o-ethynylaryl)acrylamides (1,7-enynes) is described for the first time. Microwave irradiation enabled the ultrafast synthesis of 2-quinolinone-fused γ-lactones from Fenton’s reagents in formamide. After six key consecutive reactions, including a diastereoselective step, 2-quinolinone-fused γ-lactones were obtained in good overall
Photoredox Decarboxylative Alkylation/(2+2+1) Cycloaddition of 1,7‐Enynes: A Cascade Approach Towards Polycyclic Heterocycles Using
<i>N</i>
‐(Acyloxy)phthalimides as Radical Source
作者:José Tiago Menezes Correia、Gustavo Piva da Silva、Elias André、Márcio Weber Paixão