Synthesis of Pyrrole Derivatives from Diallylamines by One-Pot Tandem Ring-Closing Metathesis and Metal-Catalyzed Oxidative Dehydrogenation
作者:Weiqiang Chen、Jianhui Wang
DOI:10.1021/om400046r
日期:2013.3.25
A series of aryl-substituted pyrrole derivatives was synthesized from diallylamines through a ruthenium carbene catalyzed ring-closingmetathesis reaction and in situ oxidative dehydrogenation reaction catalyzed by FeCl3·6H2O or CuCl2·2H2O in the presence of O2. The reaction was mild, simple, and convenient. An oxygen atmosphere played a critical role in obtaining high conversion of substituted pyrroles
A convenient one-pot synthesis of N-aryl-3-pyrrolines
作者:Karamil Jayaprakash、Chittoor S. Venkatachalam、Kalpattu K. Balasubramanian
DOI:10.1016/s0040-4039(99)01334-9
日期:1999.8
N-propargylanilines, under one-pot homologation conditions, undergo an in situ cyclisation catalysed by Cu(I) to yield 3-pyrrolines in good yield. (C) 1999 Elsevier Science Ltd. All rights reserved.
Assisted tandem catalytic RCM-aromatization in the synthesis of pyrroles and furans
作者:Bernd Schmidt、Stefan Krehl、Eric Jablowski
DOI:10.1039/c2ob25543j
日期:——
An assisted tandem catalytic transformation of diallyl amines and diallyl ethers into N-aryl pyrroles and furans, respectively, is described. The sequence relies on ring closing metathesis followed by dehydrogenation of the initially formed dihydropyrroles and dihydrofurans. Both steps are Ru-catalyzed, but the sequence requires only one precatalyst, because conversion of the metathesis catalyst into
Highly efficient Ru(<scp>ii</scp>)–alkylidene based Hoveyda–Grubbs catalysts for ring-closing metathesis reactions
作者:Mariam Y. Al-Enezi、Elizabeth John、Yehia A. Ibrahim、Nouria A. Al-Awadi
DOI:10.1039/d1ra07428h
日期:——
Three novel phosphine-free Ru-alkylidenes (7a–7c) have been synthesized and utilized as efficient catalysts for ring closing metathesis (RCM) reaction. Spectroscopic data, i.e. NMR and HRMS, along with single crystal X-ray diffraction analysis, were used to confirm their chemical structures. The tosylated carbenoid 7b showed the highest efficiency in cyclizing different acyclic diene substrates. RCM
已经合成了三种新型的不含膦的 Ru-亚烷基 ( 7a-7c ),并将其用作闭环复分解 (RCM) 反应的有效催化剂。光谱数据,即NMR 和 HRMS,以及单晶 X 射线衍射分析,用于确认它们的化学结构。甲苯磺酰化的类胡萝卜素7b在环化不同的无环二烯底物方面表现出最高的效率。与众所周知的 Grubbs 相比,仅使用催化量 (0.5–2.0 mol%) 的添加剂催化剂 ( 7b ) 就可以很好地耐受各种(未)取代的N、N-二烯丙基苯胺衍生物的 RCM 和不同大分子二烯的立体选择性 RCM (II) 和 Hoveyda-Grubbs (II) 催化剂。