Abstract The cyclization reaction of 2-ethynyl- N -sulfonylanilides proceeded efficiently in water with the presence of a catalytic amount of K 2 CO 3 under transition metal-free condition to give indoles in high yields. The recovery and reusability of the present catalytic system were investigated.
摘要在无过渡金属条件下,在催化量的K 2 CO 3存在下,2-乙炔基-N-磺酰腈在水中的环化反应有效地进行,从而获得了高产率的吲哚。研究了本催化体系的回收率和可重复使用性。
Silver-catalyzed cascade cyclization–stannylation of o-alkynylaniline derivatives with 2-tributylstannylfuran: an efficient synthesis of (3-indolyl)stannanes
作者:Jun Liu、Xin Xie、Yuanhong Liu
DOI:10.1039/c3cc46524a
日期:——
A straightforward synthesis of (3-indolyl)stannanes through silver-catalyzed cyclizationâstannylation of N-electron-withdrawing group-substituted o-alkynylanilines in the presence of 2-tributylstannylfuran is developed. This method offers several advantages such as no requirement of additional ligands, high efficiency and a wide reaction scope.
Facile synthesis of 2-substituted benzo[<i>b</i>]furans and indoles by copper-catalyzed intramolecular cyclization of 2-alkynyl phenols and tosylanilines
CuCl and Cs2CO3 was employed to synthesize a variety of 2-substituted benzo[b]furans and indoles by an intramolecular cyclization of 2-alkynyl phenols and tosylanilines. This protocol features mild conditions, high yields and broad substrate scope, which makes it a practical method for the synthesis of 2-substituted benzo[b]furans and indoles.
催化量的 CuCl 和 Cs 2 CO 3用于通过 2-炔基酚和甲苯磺酰苯胺的分子内环化合成各种 2-取代的苯并[ b ]呋喃和吲哚。该方案条件温和、产率高、底物范围广,是合成2-取代苯并[ b ]呋喃和吲哚的实用方法。
A tandem phospha‐Michael addition/N‐acylation/intramolecular Wittigreaction of in situ formed aza‐o‐QMs is disclosed. This approach features high functional group tolerance and provides a convenient and practical access to biologically significant indole derivatives (37 examples, up to 91% yield) under mild reaction conditions.