A Novel Synthesis of Naphthazarin and Juglone Derivatives by Reaction of Naphthazarin and Juglone with Cyclic Enol Ethers
作者:Yasuhiro Tanoue、Akira Terada、Hiroshige Taniguchi、Tadashi Okuma、Hiroshi Kaai、Mihoko Anan、Yasuyuki Kakara、Mika Doi、Shin-ichi Morishita
DOI:10.1246/bcsj.66.3712
日期:1993.12
presence of BF3·OEt2 gave naphthazarin derivatives such as cycloshikonin, having a cyclic ether substituent, in one step. Cyclic enol ethers did not attack the quinone ring of naphthazarin but the benzene ring, and the corresponding naphthazarin derivatives were produced after tautomerization. This reaction was applicable to juglone to give juglone derivatives bearing a cyclic ether substituent.
在BF3·OEt2的存在下,萘甲素与环烯醇醚在乙酸中的反应一步得到萘甲素衍生物,例如具有环醚取代基的环紫草素。环状烯醇醚不攻击萘并芴的醌环,而是攻击苯环,互变异构化后生成相应的萘并衍生物。该反应适用于胡桃酮,得到带有环醚取代基的胡桃酮衍生物。