Novel strategies for the synthesis of anthrapyran antibiotics: discovery of a new antitumor agent and total synthesis of (S)-espicufolin
作者:Lutz F. Tietze、Kersten M. Gericke、Ramakrishna Reddy Singidi、Ingrid Schuberth
DOI:10.1039/b700838d
日期:——
Two high-yielding strategies for the synthesis of 4H-anthra[1,2-b]pyran antibiotics have been developed giving access to novel antitumor agent (ED(50) 1.5 microm) and to (S)-espicufolin (3). A key step for the assembly of the tetracyclic 4H-anthra[1,2-b]pyran-4,7,12-trione skeleton is the nucleophilic addition of an aryl lithium species onto an aldehyde which allows the introduction of either an ynone
已经开发了两种合成4H-蒽[1,2-b]吡喃抗生素的高产策略,可以使用新型抗肿瘤药(ED(50)1.5 microm)和(S)-espicufolin(3)。组装四环4H-蒽[1,2-b]吡喃-4,7,12-三酮骨架的关键步骤是芳基锂物质在醛上的亲核加成,从而允许引入炔酮或1,3-二酮侧链,用作酸催化环化反应的前体。