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Synthesis of Five‐Membered Ring Heteroaryl Pyridines from Heteroaryllithium andN‐Ethoxycarbonylpyridinium Chlorides

 

作者: Long‐Li Lai,   Li‐Hua Shin,   Pen‐Yuan Lin,   Jy‐Shih Wang,   Min‐Jen Shiao,  

 

期刊: Journal of the Chinese Chemical Society  （WILEY Available online 1994）
卷期: Volume 41, issue 1  

页码: 75-79

 

ISSN:0009-4536

 

年代: 1994

 

DOI:10.1002/jccs.199400009

 

出版商: WILEY‐VCH Verlag

 

关键词: Heteroarylpyridines;Furylpyridines;Thienylpyridines;Imidazylpyridines;N‐Ethoxycarbonylpyridinium chloride

 

数据来源: WILEY

 

摘要:

AbstractFurylpyridines, thienylpyridines, and imidazolylpyridines were obtained regioselectively in 40‐67% yields from the reaction of heteroaryllithiums withN‐ethoxycarbonylpyridinium chloride orN‐ethoxycarbonyl‐3‐methylpyridinium chloride in the presence of Cul in a catalytic amount at −78 °C or −50°C, then followed by oxidation. The regioselectivity of this reaction depended upon temperature of the reaction and the nature of het

 

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