An Unprecedented Route for the Synthesis of 3,3′-Biindoles by Reductive Cyclization of 3-[2-Nitro-1-(2-nitrophenyl)ethyl]-1H-indoles Mediated by Iron/Acetic Acid
作者:Chintakunta Ramesh、Veerababurao Kavala、Chun-Wei Kuo、B. Rama Raju、Ching-Fa Yao
DOI:10.1002/ejoc.201000276
日期:——
An unprecedented route for the synthesis of 3,3'-biindoles is developed. Both symmetrical and unsymmetrical 3,3'-bi-indoles could be generated by this method. Mild conditions, high yields of the products, and environmentally acceptable reagent are the merits of the procedure.
quater‐heteroaryls have been prepared under indium catalysis by nucleophilicaromaticsubstitution (SNAr). This is the first example of catalytic heteroaryl–heteroaryl bond formation based on SNAr between two heteroaryl substrates without needing activating groups to enhance their reactivity (see scheme; El=electrophile, In=In(OTf)3 or In(ONf)3, Nu=nucleophile).
独特的性能:在铟催化下,通过亲核芳族取代(S N Ar)制备了二,三和四杂杂芳基。这是基于两个杂芳基底物之间基于S N Ar的催化杂芳基-杂芳基键催化形成的第一个示例,无需活化基团来增强其反应性(参见方案; El =亲电子试剂,In = In(OTf)3或In(ONf)3,Nu =亲核试剂)。
BERGMAN J.; EKLUND N., TETRAHEDRON, 1980, 36, NO 10, 1445-1450