An electrochemical tandem oxidative azidation and intramolecular cyclization strategy for the synthesis of quinoxaline derivatives
作者:Kai Zhou、Shendan Xia、Zhiwei Chen
DOI:10.1039/d3ob00558e
日期:——
An electrochemical-oxidation-induced intramolecular annulation for the synthesis of quinoxalines was developed under undivided electrolytic conditions. N-Aryl enamines and TMSN3 as the starting materials could smoothly participate in the transformation to achieve the construction of two C–N bonds through tandem azidation and cyclic amination reactions. The reaction could be easily handled and avoided
Copper(II)-Catalyzed Sequential C,N-Difunctionalization of 1,4-Naphthoquinone for the Synthesis of Benzo[<i>f</i>]indole-4,9-diones under Base-Free Condition
作者:Jin-Wei Sun、Xiang-Shan Wang、Yun Liu
DOI:10.1021/jo401842d
日期:2013.10.18
An efficient synthesis of benzo[f]indole-4,9-diones has been achieved by copper(II)-catalyzed naphthoquinone sequential C,N-difunctionalization reactions with beta-enaminones. New C-C and C-N bonds are easily formed in the reaction course. Copper(II) salt plays a dual role as Lewis acid and oxidative catalyst, and O-2 acts as the terminal oxidant. The advantage of this reaction is the high atom economy with broad substrate scope and excellent yields. The reaction can be scaled up to using at least grams of substrates.
Iodide-Ion-Catalyzed Carbon-Carbon Bond-Forming Cross-Dehydrogenative Coupling for the Synthesis of Indole Derivatives
作者:Zhenhua Jia、Takashi Nagano、Xingshu Li、Albert S. C. Chan
DOI:10.1002/ejoc.201201585
日期:2013.2
nBu4NI-catalyzed intramolecular cross-dehydrogenativecoupling (CDC) reaction has been applied to the synthesis of 1H-indole derivatives. Intramolecular oxidative coupling of N-arylenamines proceeded in the presence of a catalytic amount of nBu4NI and tert-butyl hydroperoxide (TBHP) to afford the corresponding 1H-indole derivatives in good-to-excellent yields. A preliminary study of the synthesis of 3H-indole is also
作者:Vinzenz Thönnißen、Iuliana L. Atodiresei、Frederic W. Patureau
DOI:10.1002/chem.202300279
日期:——
enantioselective Nenitzescu: A simple Jacobsen-type chromium(III)-salen complex has been used as a chiral enantiopure Lewis acid catalyst for a highly atroposelective Nenitzescu indolesynthesis. Its practicality should make C−N atroposelective synthesis more accessible.