钯催化的级联协议已建立的4-甲基-1-(1-合成ħ吡咯并[2,3- b ] -喹喔啉-2-基)环己醇和2-苯基-1-(1- ħ -吡咯并[2,3 - b ]喹喔啉-2-基)丙-1-醇通过N-烷基(芳基)-3-氯喹喔啉-2-胺与碳化钙和环己酮或2-苯基丙醛的反应而形成。此一锅法在Sonogashira偶联反应的关键步骤中不使用任何铜盐进行,提供了一种在催化量存在下合成2,3-二取代吡咯并[2,3- b ]喹喔啉的有效方法Pd(PPh 3)2 Cl 2的含量在DMSO / H 2 O中的产率很高。该策略的好处是使用市售的,廉价的和危害较小的主要化学原料碳化钙作为湿溶剂中的乙炔源。
Regioselective synthesis of 2,3-disubstituted 1-alkyl pyrrolo[2,3-b] quinoxalines through palladium-catalyzed Heck reaction of chalcones and evaluation of their anti-bacterial activities
The regioselective synthesis of 1-alkyl-2-aryl-3-acyl pyrrolo[2,3-b]quinoxalines through palladium-catalyzed Heck coupling reaction/heteroannulation was reported. The reaction of N-alkyl/benzyl-3-chloroquinoxaline-2-amines with chalcones catalyzed by Pd(OAc)2 in the presence of KOtBu, as the base, in DMSO afforded the desired products in good-to-high yields. The MIC and MBC determinations revealed
报道了通过钯催化的Heck偶联反应/杂环化反应的1-烷基-2-芳基-3-酰基吡咯并[2,3- b ]喹喔啉的区域选择性合成。的反应ñ -烷基/苄基-3-氯喹喔啉-2-胺与通过将Pd(OAC)催化查耳酮2在KO的存在吨卜,作为碱,在DMSO中,得到良好的到高的产率的期望的产物。MIC和MBC的测定表明,这些化合物可用于未来开发抗生素的研究工作中。
Rapid Synthesis of 2-Alkanol-substituted Pyrrolo[2,3-<i>b</i>
]quinoxalines from Propargylic Alcohols <i>via</i>
Copper-free Sonogashira Coupling Reaction at Room Temperature
efficient procedure is established for the synthesis of 2‐alkanol‐substituted pyrrolo[2,3‐b]quinoxalines by the reaction of N‐alkyl‐3‐chloroquinoxaline‐2‐amines with propargylic alcohols. The reaction is carried out in the absence of any copper salt but in the presence of a catalytic amount of Pd(PPh3)2Cl2 at room temperature. The Sonogashira coupling reaction step in this procedure is fast, producing
通过N-烷基-3-氯喹喔啉-2-胺与炔丙醇的反应,建立了一种实用且有效的程序,用于合成2-链烷醇取代的吡咯并[2,3- b ]喹喔啉。该反应在室温下在不存在任何铜盐但在催化量的Pd(PPh 3)2 Cl 2的存在下进行。此过程中的Sonogashira偶联反应步骤快速,可高产量生产清洁的产品,而不会受到不必要的均偶联Glaser反应产物的污染。还针对三种细菌菌株Luteus Luteus,铜绿假单胞菌(Pseudomonas aeruginosa),和枯草芽孢杆菌。
Synthesis of Unexpected Pyrrolo[2,3-b]quinoxaline-2-carbaldehydes via Sonogashira Coupling Reaction
作者:Ali Keivanloo、Mohammad Bakherad、Amin Rahimi
DOI:10.1055/s-0029-1218715
日期:2010.5
The reaction of a number of N-alkyl-3-chloroquinoxaline-2-amines with propargyl bromide in the presence of PdCl2(PPh3)2 and copper(I) iodide in wet morpholine leads to the formation of the unexpected N-substituted pyrrolo[2,3-b]quinoxaline-2-carbaldehydes in good yields. A possible mechanism for the conversion is suggested.
A one-pot reaction of N-alkyl-3-chloroquinoxaline-2-amines with acetylenic alcohols in the presence of a Pd-Cu catalyst leads to the formation of 2-formyl/acetyl-N-substituted pyrrolo[2,3-b]quinoxalines in good to high yields. A possible mechanism for the conversion has also been proposed.