Construction of C(sp<sup>2</sup>)–X (X = Br, Cl) Bonds through a Copper-Catalyzed Atom-Transfer Radical Process: Application for the 1,4-Difunctionalization of Isoquinolinium Salts
作者:Qiu Sun、Yuan-Yuan Zhang、Jing Sun、Ying Han、Xiaodong Jia、Chao-Guo Yan
DOI:10.1021/acs.orglett.7b03751
日期:2018.2.16
A highly efficient Cu-catalyzed 1,4-difunctionalization of isoquinolinium salts was developed with ether and X– (X = Br, Cl) as the halogen source under mild conditions. This transformation involves the combination of oxidative coupling and copper-catalyzed halogen atom-transfer radicalprocesses. This method not only provides an efficient way to prepare various substituted azaarenes but also achieves
Construction of Tropane Derivatives by the Organocatalytic Asymmetric Dearomatization of Isoquinolines
作者:Jin‐Hui Xu、Sheng‐Cai Zheng、Ji‐Wei Zhang、Xin‐Yuan Liu、Bin Tan
DOI:10.1002/anie.201605736
日期:2016.9.19
A chiral‐NHC‐catalyzed highly diastereo‐ and enantioselective dearomatizing double Mannich reaction of isoquinolines was developed that provides a powerful and straightforward synthetic route toward substituted tropane derivatives with four contiguous stereocenters. A unique feature of this strategy is the use of readily available isoquinolines to provide two reactive sites for dearomatization, thus
Hydride transfer-initiated synthesis of 3-functionalized quinolines by deconstruction of isoquinoline derivatives
作者:Wenhui Mao、He Zhao、Min Zhang
DOI:10.1039/d2cc00127f
日期:——
Under transition metal catalyst-free conditions, we herein present a hydride transfer-initiated construction of novel 3-(2-aminomethyl)aryl quinolines from N-isoquinolinium salts and 2-aminobenzaldehydes, proceeding with the merits of operational simplicity, high step and atom efficiency, good substrate and functional group compatibility, and mild conditions. The products are formed by reacting with
Synthesis of Perfluoroalkyl-Substituted Azines via Nucleophilic Substitution of Hydrogen with Perfluoroisopropyl Carbanions
作者:Rafał Loska、Mieczysław Ma̧kosza
DOI:10.1021/jo062254u
日期:2007.2.1
a new protocol for introduction of perfluoroalkyl substituents into azine rings was elaborated via oxidative nucleophilic substitution of hydrogen. It involves three chemical steps: (i) alkylation of azine with p-MeOC6H4CH2Br, (ii) reaction of the resulting salt with fluorinated carbanions generated in situ from HFP and KF, and (iii) N-deprotection and aromatization of the isolated dihydroazine on
通过在适当的溶剂中用固体KF处理全氟丙烯(HFP)原位生成的全氟异丙基碳负离子会添加到N-烷基吡啶鎓,喹啉鎓和其他叠氮盐中,从而生成具有全氟异丙基的合理稳定的N-烷基二氢嗪。在大多数情况下,加成在杂环的2位进行。这些二氢嗪的稳定性取决于N-烷基和嗪环中存在的其他取代基的性质。在与三氟乙酸酐的反应中,它们中最不稳定的被转化为其稳定的C-三氟乙酰基衍生物。的治疗Ñ苄基或ñ - p-甲氧基苄基-2-全氟异丙基二氢嗪与氧化剂如DDQ或硝酸铈(IV)铵导致苄基C-N键断裂,然后氧化环,得到在芳族环中具有全氟异丙基的吡啶或喹啉。基于这些发现,通过氢的氧化亲核取代,拟订了将全氟烷基取代基引入到嗪环中的新方案。它涉及三个化学步骤:(i)用p -MeOC 6 H 4 CH 2使嗪烷基化Br,(ii)所得盐与从HFP和KF原位生成的氟化碳负离子反应,以及(iii)用CAN处理后,分离出的二氢嗪进行N-脱保护和
N-benzylisoquinolinium 4-dithiocarboxylate adducts from N-benzylisoquinolinium halides and carbon disulfide