Copper- and Ligand-free Heteroannulation of<i>o</i>-Halohydroxypyridine with Terminal Alkynes Using Pd/C Catalyst: One-Pot Synthesis of 2-Substituted Furopyridines and their Functionalization
作者:Hee Jung Park、Ji-Eun Kim、Eul Kgun Yum、Young Hoon Kim、Chang-Woo Han
DOI:10.1002/bkcs.10052
日期:2015.1
3‐b]pyridine and furo[3,2‐c]pyridine were prepared using Pd/C‐catalyzed heteroannulation of o‐halopyridinols and terminal alkynes under copper‐ and ligand‐free conditions. We also demonstrated that double functionalization yielding 2,3‐disubstituted furopyridines could be achieved through heteroannulation followed by bromination and Suzuki/Heck reactions. In addition, the use of recoverable Pd/C in the absence
使用Pd / C催化的邻卤代吡啶并异氰酸酯化制备三种类型的2-取代的呋喃并[3,2- b ]吡啶,呋喃[2,3– b ]吡啶和呋喃[3,2– c ]吡啶。无铜和无配体条件下的末端炔烃。我们还证明,通过异环化,随后进行溴化和Suzuki / Heck反应,可以实现产生2,3-二取代的呋喃吡啶的双重功能化。另外,在不存在助催化剂和配体的情况下使用可回收的Pd / C可有助于开发更绿色的化学工艺。