Concise approach to 1,4-dioxygenated xanthones via novel application of the Moore rearrangement
作者:Alexander L. Nichols、Patricia Zhang、Stephen F. Martin
DOI:10.1016/j.tet.2012.05.094
日期:2012.9
synthesis of 1,4-dioxygenated xanthones and related natural products employing the Moore rearrangement as a key transformation has been developed. The approach features an acetylide stitching step to unite a substituted squaric acid with a protected hydroxy benzaldehyde derivative to provide a key intermediate that undergoes facile Moore rearrangement to deliver a hydroxymethyl aryl quinone. Subsequent
1,4-双氧合氧杂蒽酮和相关天然产物的快速合成已开发出采用摩尔重排作为关键转化。该方法采用乙炔缝合步骤,将取代的方酸与受保护的羟基苯甲醛衍生物结合,以提供关键中间体,该中间体经过简单的摩尔重排以提供羟甲基芳基醌。随后的氧化、羟基脱保护和环化得到高度官能化的氧杂蒽酮。该方法的效用通过其在天然存在的呫吨酮1的简洁和有效合成中的应用而得到证明。一种被命名为 dulcisxanthone C 的天然产物的结构也被修正为 xanthone 1 的结构。