Ruthenium-catalyzed direct C3 alkylation of indoles with α,β-unsaturated ketones
作者:Shuai-Shuai Li、Hui Lin、Xiao-Mei Zhang、Lin Dong
DOI:10.1039/c4ob02124j
日期:——
paper, a simple and highly efficient ruthenium-catalyzed direct C3 alkylation of indoles with various alpha,beta-unsaturated ketones without chelation assistance has been developed. This novel C-H activation methodology exhibits a broad substrate scope such as different substituted indoles, pyrroles, and other azoles. Further synthetic applications of the alkylation products can lead to more attractive
Abstract A simple and novel bimetallic catalyst, an iron and magnesium complex (Fe‐Mg‐hexamethylphosphoramide (HMPA)), with dual activation was found to be an effective and promising catalyst for the Michael‐type Friedel–Craftsreactions of indoles with chalcones. This novel catalytic system has the advantages of highly efficient, mild reaction conditions and exhibits high reactivity and selectivity
摘要 一种简单而新颖的双金属催化剂,铁和镁配合物(Fe-Mg-六甲基磷酰胺(HMPA)),具有双重活化作用,被发现是吲哚与查耳酮的 Michael 型 Friedel-Crafts 反应的有效且有前景的催化剂。这种新型催化体系具有高效、反应条件温和、反应活性和选择性高的优点,使其成为合成吲哚衍生物的有用且有吸引力的方法。
A mild, efficient and improved protocol for the synthesis of novel indolyl crown ethers, di(indolyl)pyrazolyl methanes and 3-alkylated indoles using H4[Si(W3O10)3]
作者:Rajendran Murugan、Murugesan Karthikeyan、Paramasivam T. Perumal、Boreddy S.R. Reddy
DOI:10.1016/j.tet.2005.09.108
日期:2005.12
Efficient electrophilic substitution reactions of indoles with various aldehydes proceed smoothly in acetonitrile using heteropoly acid (H-4[Si(W3O10)(3)]) to afford the corresponding new indolyl crown ethers and di(indolyl)pyrazolyl methanes. H-4[Si(W3O10)(3)] is also found to catalyze the Michael addition of indoles to alpha,beta-unsaturated compounds for the synthesis of 3-alkylated indoles. (c) 2005 Elsevier Ltd. All rights reserved.