Pd-Catalyzed Copper-Free Carbonylative Sonogashira Reaction of Aryl Iodides with Alkynes for the Synthesis of Alkynyl Ketones and Flavones by Using Water as a Solvent
作者:Bo Liang、Mengwei Huang、Zejin You、Zhengchang Xiong、Kui Lu、Reza Fathi、Jiahua Chen、Zhen Yang
DOI:10.1021/jo050498t
日期:2005.7.1
Pd-catalyzed copper-free carbonylative Sonogashira coupling reaction to synthesize alkynyl ketones from terminal alkynes and aryl iodides was achieved by using water as a solvent. The reaction was carried out at room temperature under balloon pressure of CO with Et3N as a base. The developed method was successfully applied to the synthesis of flavones.
Light-enabled, AlCl<sub>3</sub>-catalyzed regioselective intramolecular nucleophilic addition of non-nucleophilic alkyls to alkynes
作者:Yanbin Zhang、Ruiwen Jin、Guangxing Pan、Hao Guo
DOI:10.1039/d0cc04636a
日期:——
regioselective intramolecularnucleophilic cyclization of alkynes using non-nucleophilic alkyls as the nucleophile is reported. Upon photoexcitation, o-alkylphenyl alkynyl ketones can be transferred into (E)-photoenols. Thus, a nucleophilic methylene is formed from the non-nucleophilic alkyl. An AlCl3 catalyst can stabilize the (E)-photoenol intermediate and facilitate further intramolecularnucleophilic cyclization
Synthesis of Ynones via Recyclable Polystyrene-Supported Palladium(0) Complex Catalyzed Acylation of Terminal Alkynes with Acyl Chlorides under Copper- and Solvent-Free Conditions
Herein, a highly efficient method for the copper- and solvent-freecoupling reaction of acyl chlorides and terminal alkynes catalyzedby 1-phenyl-1,2-propanedione-2-oxime thiosemicarbazone-functionalizedpolystyrene resin-supported Pd(0) complex is described. Acyl chloridesare easily coupled with terminal alkynes, giving good to high yieldsin the presence of a low catalyst loading (1 mol% Pd) inEt 3 N
在此,描述了一种由 1-苯基-1,2-丙二酮-2-肟氨基硫脲官能化聚苯乙烯树脂负载的 Pd(0) 配合物催化的酰氯和末端炔烃的无铜和无溶剂偶联反应的高效方法。酰氯很容易与末端炔烃偶联,在室温和有氧条件下,在 Et 3 N 中存在低催化剂负载量(1 mol% Pd)的情况下,可产生良好或高产率。离心后,负载型催化剂可以回收和重复使用多次,活性仅略有下降。
A copper- and solvent-free coupling of acid chlorides with terminal alkynes catalyzed by a polystyrene-supported palladium(0) complex under aerobic conditions
A polystyrene-supported palladium(0) complex [PS-dpp-Pd(0)] is an efficient catalyst for the copper- and solvent-free acylation of terminal alkynes with different acid chlorides in the presence of triethylamine as base, giving the corresponding ynones in good yields.