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
Base-promoted aerobic oxidation of <i>N</i>-alkyl iminium salts derived from isoquinolines and related heterocycles
作者:Li-Gang Bai、Yue Zhou、Xin Zhuang、Liang Zhang、Jian Xue、Xiao-Long Lin、Tian Cai、Qun-Li Luo
DOI:10.1039/c9gc03629f
日期:——
scope, low cost, feasibility of scale up, wide availability of reagents, and green reaction conditions, this method shows great potential for preparing isoquinolones and related compounds. The method was applied for atom- and step-economical total synthesis of natural products such as norketoyobyrine.
Two novel ion-pair complexes, [RBzIQI](+)[Ni(mnt)(2)](-) (mnt(2-) = maleonitriledithiolate, [RBzIQI](+) = 4-R-benzylisoquinolinium; R = H (1), Cl (2)) have been characterized structurally and magnetically. The Ni(mnt)(2)(-) anions and [BzIQI](+) cations of I form I D column of alternating between cations and anions via pi... pi stacking interaction between Ni(mnt)(2) plane and isoquinoline ring, and the Ni(mnt)2 anions between adjacent columns exist C... N, C... N, and N... N interaction. The anions and cations of 2 stack into well-segregated columns in the solid state; and the Ni(111) ions form a ID zigzag chain in a Ni(mnt)(2) column through intermolecular Ni... S, S... S, Ni... Ni or pi... pi interactions. The chain is uniform in 2 with the Ni... Ni distances of 3.784 angstrom. Magnetic susceptibility measurements for these complexes in the temperature range 1.8-300 K show that I exhibits antiferromagnetic coupling behavior, and 2 exhibits unusual magnetic phase transitions around 45 K. The overall magnetic behavior for 2 indicates the presence of antiferromagnetic interaction in the high-temperature phase (HT) and spin gap in the low-temperature phase (LT). (c) 2006 Elsevier B.V. All rights reserved.