A new synthesis of versatile indolyl-3-carbonylnitriles
摘要:
Indolyl-3-carbonylnitriles are compounds with demonstrated utility as intermediates in organic chemistry. However, their synthesis remains a challenge, requiring the use of toxic sources Of cyanide, and often proceeding in low yields. Accordingly, presented here is a new synthesis of these versatile reactants, via dehydration of easily accessible alpha-oxoacetamides in generally high yields under simple reaction conditions. (C) 2015 Elsevier Ltd. All rights reserved.
New Three-Component Glyoxylation-Decarbonylative Stille Coupling Sequence to Acyl Heterocycles under Mild Conditions
作者:Thomas Müller、Boris Tasch、Eugen Merkul、Walter Frank
DOI:10.1055/s-0029-1218802
日期:2010.7
A consecutive sequence of glyoxylation of 1-methyl-1H-indole, 1-(4-methoxybenzyl)-1H-pyrrolo[2,3-b]pyridine or N-substituted pyrroles with oxalyl chloride and subsequent decarbonylative Stille coupling under very mild, Lewis acid free conditions using all reactants in equimolar quantities is reported. As an illustration, this glyoxylation-decarbonylative couplingsequence was elaborated into a consecutive
1-甲基-1 H-吲哚,1-(4-甲氧基苄基)-1 H-吡咯并[2,3- b ]吡啶或N-取代的吡咯与草酰氯的乙氧基化连续序列,随后在非常低的温度下进行脱羰Stille偶联报道了使用所有等摩尔量反应物的温和,无路易斯酸条件。作为说明,该乙氧基化-脱羰基偶联序列被精加工为1-甲基-3-(1-甲基-4,5-二氢-1 H-吡唑-3-基)-1 H的连续四组分合成-吲哚乙醛酸化-脱羰基Stille反应-多组分反应-CC偶联-酰基杂环
Three-Component Synthesis of Ynediones by a Glyoxylation/Stephens-Castro Coupling Sequence
作者:Eugen Merkul、Janis Dohe、Charlotte Gers、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/anie.201007194
日期:2011.3.21
two steps forward! Starting from diverse heterocycles, the title reaction furnishes ynediones under very mild conditions in a direct and preparatively simple one‐pot process. The key to avoiding decarbonylation is the CuI‐catalyzed Stephens–Castro alkynylation rather than the usually more efficient Sonogashira coupling. In addition, novel highly atom‐economical four‐component syntheses of various heterocycles
Consecutive Three-Component Synthesis of Ynones by Decarbonylative Sonogashira Coupling
作者:Eugen Merkul、Thomas Oeser、Thomas J. J. Müller
DOI:10.1002/chem.200900119
日期:2009.5.11
7‐aza‐indoles, or pyrroles with oxalyl chloride and subsequent Pd/Cu‐catalyzed decarbonylative alkynylation with terminal alkynes furnishes alkynones under very mild conditions. 4‐(Indol‐3‐yl)‐, 4‐(7‐aza‐indol‐3‐yl)‐, and 4‐(pyrrol‐2‐yl)‐2‐amino pyrimidines can be readily obtained in a concise two‐step synthesis starting from N‐substituted indoles, 7‐aza‐indoles, or pyrroles (see scheme).
One-pot synthesis of heteroaryl diketoalkynyl C-glycoside and dialkynyl di-C-glycoside analogues by three-component successive coupling reaction
作者:Xiang Zhou、Liming Wang、Fuyi Zhang、Yufen Zhao
DOI:10.1016/j.carres.2023.108830
日期:2023.7
The synthesis of heteroaryl diketoalkynyl C-glycoside and dialkynyl di-C-glycoside analogues has been accomplished by successive coupling of heteroaromatics, oxalyl chloride and terminal sugar alkynes in one pot. The three-component coupling reaction catalyzed by CuI gives heteroaryl diketoalkynyl C-glycosides. The same three-component coupling in the presence of n-BuLi produces dialkynyl di-C-glycosides
杂芳基二酮炔基C-糖苷和二炔基二-C-糖苷类似物的合成是通过在一锅中连续偶联杂芳烃、草酰氯和末端糖炔完成的。由 CuI 催化的三组分偶联反应得到杂芳基二酮炔基C-糖苷。在n-BuLi存在下同样的三组分偶联产生二炔基二-C-糖苷,杂芳烃与末端糖炔烃的摩尔比为1:1,得到相应的二炔基二-C-酯。-糖苷。以良好至极好的收率获得了所需的产品。这种顺序一锅法温和高效,适用于不同的杂芳烃和末端糖炔烃。糖炔烃包括呋喃糖苷、吡喃糖苷和无环糖。给出了二十七个例子。已经阐明了形成所需产物的机制。