A Synthetic Approach to Benanomicin A. 2. Synthesis of the Substituted 5,6-Dihydrobenzo(a)naphthacenequinone.
作者:TOSHIO NISHIZUKA、SEHEI HIROSAWA、SHINICHI KONDO、DAISHIRO IKEDA、TOMIO TAKEUCHI
DOI:10.7164/antibiotics.50.755
日期:——
The key intermediate α-substituted α-tetralone (8) has been synthesized, either via tandem MICHAEL addition-DIECKMANN condensation reaction between dienolate and methyl crotonate in a low yield or via BARTON'S radical decarboxylation of diester (9) without 4-dimethylaminopyridine in 75% yield, and applied to the synthesis of the substituted 5, 6-dihydrobenzo[a]naphthacenequinone.
通过二烯酸酯和巴豆酸甲酯之间的串联米歇尔加成-迪克曼缩合反应(收率较低),或通过二酯(9)在无 4-二甲氨基吡啶条件下的巴顿自由基脱羧反应(收率为 75%),合成了关键中间体 α-取代的 α-四氢萘酮(8),并将其应用于合成取代的 5,6-二氢苯并[a]萘醌。