Palladium-Catalysed Heteroannulation with Terminal Alkynes: a Highly Regio- and Stereoselective Synthesis of (Z)-3-Aryl(alkyl)idene Isoindolin-1-ones
摘要:
A highly regio- and stereoselective method for the synthesis of (Z)-3-aryl(alkyl)idene isoindolin-1-ones through palladium-copper catalysis is described. 2-Iodobenzamide 1 and its substituted derivatives 2-10 were reacted with terminal alkynes 11-19 in the presence of (PPh3)(2)PdCl2, CuI, and Et3N in DMF mostly at 80 degrees C for 16 h to yield the 2-alkynyl substituted benzamides 20-38, 40-45, 77 which could then be cyclised with NaOEt in EtOH to the 3-aryl(alkyl)idene isoindolin-1-ones 46-49, 51, 53-55, 57, 59-71, 73 and 75. In certain cases, the isoindolin-1-ones 50, 52, 56 and 58 could be directly obtained by the palladium-catalysed reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
A Cu-catalysed synthesis of substituted 3-methyleneisoindolin-1-one
作者:Anupal Gogoi、Srimanta Guin、Saroj K. Rout、Ganesh Majji、Bhisma K. Patel
DOI:10.1039/c4ra12782j
日期:——
A Cu-catalysed synthesis of substituted isoindolin-1-one has been achieved via a decarboxylative alkynylation–heteroannulation path.
通过脱羧炔基化-杂环化途径,已经实现了一种取代异吲哚啉-1-酮的Cu催化合成。
Palladium/Copper-Catalyzed Denitrogenative Alkylidenation and<i>ortho</i>-Alkynylation Reaction of 1,2,3-Benzotriazin-4(3<i>H</i>)-ones
作者:Madasamy Hari Balakrishnan、Subramaniyan Mannathan
DOI:10.1021/acs.orglett.9b04297
日期:2020.1.17
3-benzotriazin-4(3H)-ones with aromatic terminal alkynes is described. Furthermore, a denitrogenative ortho-alkynylation reaction of 1,2,3-benzotriazinones with aliphatic terminal alkynes is also developed. The reaction proceeds through a five-membered azapalladacyclic intermediate with the extrusion of a nitrogen molecule. The significance of the reaction is also demonstrated by a one-pot synthesis of (Z)-
A Highly Regio and Stereoselective Synthesis of (<i>Z</i>)-3-Aryl(alkyl)idene Isoindolin-1-ones via Palladium Catalyzed Annulation of Terminal Alkynes
作者:M. Khan、Nitya Kundu
DOI:10.1055/s-1997-1049
日期:——
o-Iodobenzamide or its N-substituted derivatives 4-10 and terminal alkynes 11-17 reacted in DMF in the presence of bis(triphenylphosphine)palladium(II)chloride, cuprous iodide and triethylamine leading to (Z)-3-arylidene isoindolin-1-ones (22, 24, 27 and 28) or o-alkynyl N-substituted benzamides (I). The latter could be cyclised with sodium in ethanol in a completely regio and stereoselective manner to (Z)-3-aryl(alkyl)idene isoindolin-1-ones 18-35.
A ligand-free approach to substituted (<i>Z</i>)-3-methyleneisoindolin-1-ones via Cu (I) catalyzed regio- and stereo-selective assembly of 2-iodo benzamide and terminal alkyne
作者:Rimpa De、Mrinal K. Bera
DOI:10.1080/00397911.2020.1753776
日期:2020.6.17
cost-effective synthesis of substituted 3-methyleneisoindolin -1-ones from 2-iodobenzamide and terminal alkyne under copper (I)-catalyzed condition was accomplished. The reaction affords excellent yield of the product at a relatively lower temperature and exclusive Z-selectivity was observed in the title compound. By varying the substitution pattern on N-atom of benzamide or aromatic core of the alkyne
Dichotomous Control of<i>E</i>/<i>Z</i>-Geometry in Intramolecular Cyclization of<i>o</i>-Alkynylbenzamide Derivatives Catalyzed by Organic Superbase P4-<i>t</i>Bu in the Presence/Absence of Water
作者:Chikashi Kanazawa、Masahiro Terada
DOI:10.1002/asia.200900342
日期:2009.11.2
it! An intramolecularcyclization reaction of o‐alkynylbenzamides that allows dichotomouscontrol of E/Z‐geometry has been developed using an organicsuperbase, P4‐tBu, as a catalyst. The presence/absence of water along with the use of an organicsuperbase provides the necessary control of the geometry at the exo‐double bond. The method enables efficient access to isoindolinone derivatives, an important
E / Z 做到了!邻炔基苯甲酰胺的分子内环化反应可实现E / Z几何形状的二分控制,已使用有机超碱P4- t Bu作为催化剂进行了开发。水的存在与否以及有机超碱的使用为exo- double键的几何形状提供了必要的控制。该方法能够有效利用异吲哚啉酮衍生物,这是一类重要的生物活性分子。