CuI catalyzed domino coupling–cyclization of 2-iodo-phenols and 1-alkynes to the synthesis of 2-substituted benzo[b]furans/furo-pyridines
摘要:
CuI/proline-catalyzed coupling reaction of 2-iodo-phenols with terminal alkynes and the following cyclization process is carried out successively in DMSO at 80 degrees C. Under this tandem process, 2-substituted benzo[b]furans/furo-pyridines were synthesized in good to excellent yields with a great diversity. (C) 2018 Elsevier Ltd. All rights reserved.
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 usingPd/C‐catalyzed heteroannulation of o‐halopyridinols and terminalalkynes 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。
Novel heteroaromatic CH insertion of alkylidenecarbenes. A new entry to furopyridine synthesis
作者:Tsugio Kitamura、Kuniyuki Tsuda、Yuzo Fujiwara
DOI:10.1016/s0040-4039(98)01034-x
日期:1998.7
of potassium tert-butoxide undergoes a novel heteroaromatic CHinsertion of alkylidenecarbenes generated in situ to give the corresponding furopyridine derivatives. The heteroaromatic CHinsertion shows an extremely high selectivity compared with the possible aliphatic CHinsertion. This process is also applied to furoquinoline synthesis.