通过aza-Michael / Michael / annulation序列,无金属一锅法合成含苯并呋喃酮与醌和醌
摘要:
已经开发了一种方便的无金属一锅合成苯并呋喃衍生物的方法,该方法可从简单的炔酮开始。可以通过aza-Michael / Michael / annulation序列以中等到良好的产率(高达90%)获得与生物活性分子密切相关的各种功能化的苯并呋喃。苯并呋喃的制备规模合成也已成功实现。苯并呋喃产品的应用已通过轻松转化为高度功能化的分子得到了展示,这对药物化学和有机材料化学具有重大的前景。
Rhenium-Catalyzed 1,3-Isomerization of Allylic Alcohols: Scope and Chirality Transfer
作者:Christie Morrill、Gregory L. Beutner、Robert H. Grubbs
DOI:10.1021/jo061436l
日期:2006.9.1
The scope of the triphenylsilyl perrhennate (O3ReOSiPh3, 1) catalyzed 1,3-isomerization of allylicalcohols has been thoroughly explored. It was found to be effective for a wide variety of secondary and tertiary allylicalcohol substrates bearing aryl, alkyl, and cyano substituents. Two general reaction types were found which gave high levels of product selectivity: those driven by formation of an
Aqueous Ammonia as a New Activator for Sonogashira Coupling
作者:Mohamed S. Mohamed Ahmed、Akitoshi Sekiguchi、Kentaro Masui、Atsunori Mori
DOI:10.1246/bcsj.78.160
日期:2005.1
Sonogashira coupling, which is a coupling reaction of terminal alkynes with organic halides, takes place with dilute aqueous ammonia as an activator. The reaction of several terminal alkynes and aryl iodides in the presence of small excess of aqueous ammonia at room temperature furnishes the cross-coupling product in good-to-excellent yields. A water-soluble amine with a high boiling point is alternatively employed for reactions at higher temperatures. A related coupling reaction in the presence of carbon monoxide also proceeded at room temperature and under ambient pressure to afford α,β-alkynyl ketones efficiently.
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.
Photoinduced Synthesis of<i>P</i>-Perfluoroalkylated Phosphines from Triarylphosphines and Their Application in the Copper-Free Cross-Coupling of Acid Chlorides and Terminal Alkynes
P‐perfluoroalkylated phosphines from triarylphosphines and perfluoroalkyliodides has been developed. The photoinduced reaction involves the substitution of aryl groups on the phosphorus atom with perfluoroalkyl groups to successfully afford P‐perfluoroalkylated phosphines. In addition, the P‐perfluoroalkylated phosphines were found to promote the Cu‐free cross‐coupling reaction of acid chlorides with terminal
A phosphine-free, atom-efficient cross-coupling reaction of triorganoindiums with acyl chlorides catalyzed by immobilization of palladium(0) in MCM-41
作者:Jiankang Miao、Bin Huang、Haiyi Liu、Mingzhong Cai
DOI:10.1039/c7ra08355f
日期:——
first phosphine-free heterogeneous palladium(0)-catalyzedcross-coupling of triorganoindiums with acyl chlorides has been developed that proceeds smoothly in THF at 68 °C and provides a general and powerful tool for the synthesis of various valuable aryl ketones and α,β-acetylenic ketones with high atom-economy and high yield. This phosphine-free heterogeneous palladium(0) catalyst can be easily prepared