在本文中,我们报道了钯催化的N-苯基-1H-吲哚-3-甲酰胺的双C-H活化,用于合成5,11-二氢-6H-吲哚并[3,2- c ]喹啉-6个。最佳反应条件为:20 mol%的Pd(TFA) 2为催化剂,2.0当量的Cu(OAc) 2为氧化剂,1.0当量的K 3 PO 4为碱,3.0当量的PivOH为反应剂。添加剂 DMF/二恶烷 (1:9)。当在 120 °C 下进行 24 小时时,该反应可以以中等至优异的收率提供 19 种目标吲哚喹啉酮,包括N , N '-二甲基化和N , N '-未取代的产物,这些产物是通过报道的 C-H 活化无法获得的方法论。双C-H活化反应也适用于N-苯基-1H-吲哚-2-甲酰胺并形成相应的5,7-二氢-6H-吲哚[2,3- c ]喹啉-6-酮。基于对照实验和文献的数据,提出了一种合理的反应机制来解释这种转变。
Platinum-catalyzed consecutive C–N bond formation-[1,3] shift of carbamoyl and ester groups
摘要:
The reaction of ortho-alkynylphenylureas 1 having a carbamoyl group attached to the nitrogen atom proceeded in the presence of catalytic amounts of Ptl(4), affording corresponding indole-3-carbamides 2 in moderate to high yields. In addition, the platinum-catalyzed cyclization of ortho-alkynylphenyl carbamates 3 afforded corresponding indole-3-carboxylates 4 in good yields. The present reaction proceeds through the intramolecular addition of carbon-nitrogen bonds to triple bonds, the so-called carboamination. (c) 2009 Elsevier Ltd. All rights reserved.
Samarium(II)-mediated spirocyclization by intramolecularaddition of arylradicals onto an aromatic ring was achieved by the reaction of N-(2-iodophenyl)-N-alkylbenzamides with SmI2 in the presence of HMPA, yielding spirocyclic indolin-2-one derivatives. The ether congeners afford spirocyclic benzofuran derivatives in moderate yields by arylradicaladdition onto a benzene ring without having an electron-withdrawing
Chloroform‐mediated acylative coupling of amines and indoles has been developed. Indoles and amines in chloroform were treated with dimethylzinc in the presence of air, resulting in a three‐component acylative coupling reaction in which in‐situ generation of phosgene produces indole‐3‐carboxamides.
catalyzed intramolecular dual C–Hactivation to construct indoloquinolinone derivatives under mild conditions with dioxygen as the sole oxidant. It was found that adding LA such as Sc3+ to Pd(OAc)2 sharply improved its catalytic efficiency, whereas Pd(OAc)2 alone was very sluggish. The activity improvement was attributed to the linkage of the Sc3+ cation to the Pd(II) species through a diacetate bridge that
The reaction of ortho-alkynylphenylureas 1 having a carbamoyl group attached to the nitrogen atom proceeded in the presence of catalytic amounts of Ptl(4), affording corresponding indole-3-carbamides 2 in moderate to high yields. In addition, the platinum-catalyzed cyclization of ortho-alkynylphenyl carbamates 3 afforded corresponding indole-3-carboxylates 4 in good yields. The present reaction proceeds through the intramolecular addition of carbon-nitrogen bonds to triple bonds, the so-called carboamination. (c) 2009 Elsevier Ltd. All rights reserved.