ANTHRACYCLINES. CYCLOADDITIONS OF 9-CHLORO-10-HYDROXY-1,4-ANTHRAQUINONE WITH VARIOUS BUTA-1,3-DIENES
作者:Nand L. Agarwal、Hans W. Scheeren
DOI:10.1246/cl.1982.1057
日期:1982.7.5
4-anthraquinone (10) affords an efficient, regiospecific access in two steps to tetracyclic ketones (12–14) which have been investigated as intermediates for the synthesis of anthracycline derivatives. Butadienes with a less asymmetric II-electron distribution than 9 give lower regiospecificity in cycloadditions with 10. Depending on the substituents in the used butadiene, the obtained cycloadducts are
几种取代的丁-1,3-二烯与 9-氯-10-羟基-1,4-蒽醌 (10) 的 Diels-Alder 型环加成反应提供了一种有效的、区域特异性的分两步获得四环酮 (12-14)已被研究作为合成蒽环类衍生物的中间体。不对称 II 电子分布小于 9 的丁二烯在与 10 的环加成中具有较低的区域特异性。根据所用丁二烯中的取代基,所得环加合物在反应环境下转化为芳构化产物 (15-20)。