Synthesis of Azabenzisochromanequinone Antibiotics, II: 9(6)-Hydroxy-6(9)-Azabenzisochromanequinones via Aminoisochromanes and Meldrum's Acid
作者:Carsten Tödter、Helmut Lackner
DOI:10.1055/s-1997-1222
日期:1997.5
The synthesis of 6(7)-amino-5,8-dimethosyisochromanes 7,8, precursors of the B-C ring system of benzisochromanequinone antibiotics 1, is described. Subsequent N-alkylation using Meldrum's acid/trimethyl orthoformate followed by a high temperature cyclization and oxidative demethylation yields 9(6)-0-demethyl-6(9)-azaeleutherins 13 and 6(9)-azaepinanaomycin A methyl esters 14. The novel aza-analogues allowed further studies on the structure-activity relations in the field of (aza)benzisochromanequinone antibiotics.
本文描述了苯并异色醌抗生素 1 的 B-C 环系统的前体 6(7)-氨基-5,8-二甲氧基异色醌 7,8 的合成过程。随后使用 Meldrum 酸/原甲酸三甲酯进行 N-烷基化,再经过高温环化和氧化去甲基化,得到 9(6)-0-demethyl-6(9)-azaeleutherins 13 和 6(9)-azaepinanaomycin A 甲酯 14。这些新型氮杂类似物有助于进一步研究(氮杂)苯并异色醌类抗生素的结构-活性关系。