Et<sub>2</sub>Zn-Catalyzed Intramolecular Hydroamination of Alkynyl Sulfonamides and the Related Tandem Cyclization/Addition Reaction
作者:Yan Yin、Wenying Ma、Zhuo Chai、Gang Zhao
DOI:10.1021/jo070681h
日期:2007.7.1
Intramolecularhydroamination of alkynyl amides was effected by a catalytic amount of Et2Zn (20 mol %) to form indole derivatives, and a tandem cyclization/nucleophilic addition procedure involving reaction of the indole zinc salt intermediate with acid chlorides or halides was developed to provide an efficient approach to C3-substituted indole derivatives when an excess of Et2Zn (120 mol %) was used
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.
Catalytic synthesis of indole-3-carboxamides from 2-ethynylanilines and isocyanates was achieved in the presence of a rhodium catalyst through a tandem-type, cyclization–addition sequence. This tandem-type process can be performed under mild reaction conditions, affording 2,3-disubstituted indoles in a one-pot manner generally in good to excellent yields. The broad substrate scope and good functional
Synthesis of Indoles via Diethylzinc-Mediated Intramolecular Hydroamination Reactions of Alkynyl Sulfonamides
作者:Gang Zhao、Yan Yin、Zhuo Chai、Wen-Ying Ma
DOI:10.1055/s-0028-1083236
日期:2008.12
A series of indole derivatives were synthesized through the intramolecular hydroamination of alkynyl sulfonamides using 20 mol% of diethylzinc as the catalyst. A tandem cyclization-nucleophilic addition reaction was also possible to afford C2,C3-disubstituted indoles using 120 mol% of diethylzinc.
Rh(III)-Catalyzed Cascade Annulation/C–H Activation of <i>o</i>-Ethynylanilines with Diazo Compounds: One-Pot Synthesis of Benzo[<i>a</i>]carbazoles via 1,4-Rhodium Migration
作者:Songjin Guo、Kai Yuan、Meng Gu、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.6b02534
日期:2016.10.21
A Rh(III)-catalyzed cascade annulation/C–H activation of o-ethynylanilines with diazocompounds has been developed. This concise method allows for the rapid formation of a number of benzo[a]carbazoles in high yields, exhibiting good functional group tolerance and scalability. The key to the success of this approach involves one C–N bond and two C–C bond formation, and an aryl-to-aryl 1,4-rhodium migration
已开发了一种重氮化合物催化的Rh(III)催化邻乙炔基苯胺的级联环化/ CH活化。这种简洁的方法可以高产率快速形成许多苯并[ a ]咔唑,表现出良好的官能团耐受性和可扩展性。该方法成功的关键在于一个C–N键和两个C–C键的形成,以及芳基到芳基1,4-铑的迁移。