A nickel-catalyzed tandem reaction involving cyclic esterification/C–S bond formation for synthesizing 5-oxa-11-thia-benzofluoren-6-ones
作者:Rongrong Cai、Qicai Wei、Runsheng Xu
DOI:10.1039/d0ra04367b
日期:——
A nickel-catalyzed tandemreaction involving cyclic esterification/C–S bond formation has been developed. Starting from samples containing 3-(2-hydroxy-phenyl)-acrylic acids with 2-halide-benzenethiols, versatile biologically active 5-oxa-11-thia-benzofluoren-6-one compounds were efficiently synthesized in good to high yields. This new methodology provides an economical approach toward C–S bond formation
An Efficient Synthesis of Coumestrol and Coumestans by Iodocyclization and Pd-Catalyzed Intramolecular Lactonization
作者:Tuanli Yao、Dawei Yue、Richard C. Larock
DOI:10.1021/jo0517038
日期:2005.11.1
The iodocyclization of acetoxy-containing 2-(1-alkynyl)anisoles and subsequent direct palladium-catalyzed carbonylation/lactonization provide an efficient route to naturally occurring coumestan and coumestrol, and their related analogues.
Efficient synthesis of coumarin-based tetra and pentacyclic rings using phospha-palladacycles
作者:Anant R. Kapdi、Amruta Karbelkar、Minal Naik、Suhas Pednekar、Christian Fischer、Carola Schulzke、Moniek Tromp
DOI:10.1039/c3ra43821j
日期:——
Palladacycle 4 has proved to be an efficient catalyst for the intramolecular C–H bond functionalization of coumaryl and pyronyl ethers leading to the synthesis of tri, tetra and pentacyclic compounds, some of which were characterized by X-ray analysis. A microwave-assisted one-pot procedure for obtaining the tetracyclic rings from 4-chlorocoumarin has also been carried out. Mechanistic studies were carried out using GC, UV-Vis and ESI MS.
Palladacycle 4 已被证明是香豆基醚和吡喃基醚分子内 C-H 键官能化的有效催化剂,可合成三环、四环和五环化合物,其中一些化合物通过 X 射线分析进行了表征。还进行了微波辅助一锅法从 4-氯香豆素获得四环。使用 GC、UV-Vis 和 ESI MS 进行了机理研究。