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Diazotization of Methyl 3‐Amino‐7‐Isopropyl‐2‐Methoxyazulene‐1‐Carboxylate and its 5‐Isopropyl Isomer‐ a Convenient Synthesis of 1,2‐Azulenequinone Derivatives

 

作者: Tian‐Chyuan Huang,   Yun‐Shan Lin,   Shih‐Jue Lin,   Shu‐Fan Chu,  

 

期刊: Journal of the Chinese Chemical Society  (WILEY Available online 1996)
卷期: Volume 43, issue 1  

页码: 41-44

 

ISSN:0009-4536

 

年代: 1996

 

DOI:10.1002/jccs.199600007

 

出版商: WILEY‐VCH Verlag

 

关键词: 3‐Amino‐2‐methoxyazulene;Diazotization;Azulenyl‐1‐diazonium salt;l‐Diazo‐1,2‐azulenequinone;1,2‐Azulenequinone

 

数据来源: WILEY

 

摘要:

AbstractMethyl 3‐amino‐2‐methoxy‐7‐isopropylazulene‐l‐carboxylate(8a) and its 5‐isopropyl isomer (8b) were synthesized by reduction of the 3‐nitro derivatives (7a,b) with zinc/acetic acid in excellent yields.7aand7bwere prepared by nitration and methylation of methyl 7‐isopropyl‐2‐hydroxyazulene‐l‐carboxylate (5a) and methyl 5‐isopropyl‐2‐hydroxyazulene‐l‐carboxylate (5b), respectively. Diazotization of8awith sodium nitrite in trifluoroacetic acid at 0 °C gave methyl 5‐isopropyl‐1,2‐azulenequinone‐3‐carboxylate (9a) in 91% yield. Similar reaction of8bgave the corresponding methyl 7‐isopropyl‐1,2‐azulenequinone‐3‐carboxylate (9b) in 93% yield. No evidence for

 

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