卤化铟(III)催化邻炔基苯酚的加氢烷氧基化反应,以高收率提供苯并[ b ]呋喃。反应的进行与5-内切-挖区域选择性与各种在芳烃官能酚类和以高产率使用的InI炔基部分3在DCE(5摩尔%)。实验和计算研究支持了基于炔烃的铟(III)π-路易斯酸活化,然后进行苯酚的亲核加成和最终的原金属脱金属,得到相应的苯并[ b ]呋喃的机理。DFT计算表明二聚体In 2 I 6 是通过与炔烃和羟基的新型双配位而催化的物质。
Synthesis of 2-Substituted Benzofurans from o-Iodophenols and Terminal Alkynes with a Recyclable Palladium Catalyst Supported on Nano-sized Carbon Balls under Copper- and Ligand-Free Conditions
作者:Eul Kgun Yum、Ok-Kyung Yang、Ji-Eun Kim、Hee Jung Park
DOI:10.5012/bkcs.2013.34.9.2645
日期:2013.9.20
developed a one-step synthesis of benzofurans from o-iodophenol and various terminalalkynes, byusing Pdcatalyst supported on nano-sized carbon balls (NCB) under copper- and ligand free conditions. Thisrecyclable catalyst could be reused more than 5 times in the same heteroannulation reaction. The results havedemonstrated that diverse 2-substituted benzofurans with tolerant functional groups can be prepared
E-mail: hjpark8659@kbsi.re.krReceived April 11, 2013 Accepted June 10, 2013我们开发了一种由邻碘苯酚和各种末端炔烃一步合成苯并呋喃的方法,采用纳米碳球负载钯催化剂( NCB) 在无铜和无配体条件下。这种可回收的催化剂可以在同一个异质环化反应中重复使用5次以上。结果表明,在这些条件下,可以简单方便地制备多种具有耐受官能团的2-取代苯并呋喃。关键词:苯并呋喃,纳米碳球,末端炔烃,可回收,钯催化剂环境友好和清洁的反应介质。在 Pd 催化过程中,已经报道了许多关于绿色技术的方法,例如开发可回收的钯催化剂和高效的反应方法。关于可回收的多相 Pd 催化剂,使用了多种载体。即聚合物,
Impregnated copper or palladium–copper on magnetite as catalysts for the domino and stepwise Sonogashira-cyclization processes: a straightforward synthesis of benzo[b]furans and indoles
作者:Rafael Cano、Miguel Yus、Diego J. Ramón
DOI:10.1016/j.tet.2011.12.042
日期:2012.2
An impregnated copper on magnetite catalyst is a versatile system for different domino Sonogashira-cyclization processes between 2-iodophenol and different alkynes to give the corresponding substituted benzo[b]furans. The catalyst could be recovered ten times without losing its activity. The related process using 2-iodoaniline was, however, better catalyzed by mixed palladium–copper on magnetite giving
Synthesis of benzofurans from terminal alkynes and iodophenols catalyzed by recyclable palladium nanoparticles supported on N,O-dual doped hierarchical porous carbon under copper- and ligand-free conditions
作者:Guijie Ji、Yanan Duan、Shaochun Zhang、Yong Yang
DOI:10.1016/j.cattod.2018.04.036
日期:2019.6
heterogeneous catalyst, consisting of Pd nanoparticlessupported on N,O-dual doped hierarchical porous carbon derived from naturally available and renewable biomass-bamboo shoots, which allows for highly efficient one-pot tandem reaction of o-iodophenols with terminalalkynes to synthesize biologically active 2-benzofuran derivatives under copper- and ligand-free conditions. The catalyst performed superior
A new, non‐symmetrical copper(II) pincercomplex catalyzes much more efficiently the formation of benzofuran by the reaction between ortho‐iodophenols and alkynes. The lowest catalyst loadings are realized for this reaction, and bromo‐ and chlorophenols are heteroannulated for the first time. Strong evidence for hydrophenoxylation and intramolecular halogen atom‐transfer steps catalyzed by this remarkably