作者:Dominea C. K. Rathwell、Sung-Hyun Yang、Kit Y. Tsang、Margaret A. Brimble
DOI:10.1002/anie.200903316
日期:2009.10.12
in the naphthazarin and isocoumarin fragments facilitates the acid‐mediated spiroketalization step to afford the key densely functionalized spiroketal (see picture; EOM=ethoxymethyl) in the formal synthesis of (±)‐γ‐rubromycin. A novel regioselective allyloxylation/Claisen rearrangement of 2‐azido‐1,4‐naphthoquinone provides access to the highly oxygenated naphthazarin fragment.
平衡行为:萘达沙林和异香豆素片段中电子因子的正确平衡促进了酸介导的螺酮缩合步骤,从而在(±)-γ-鲁布霉素的正式合成中提供了关键的致密功能化的螺缩酮(参见图片; EOM =乙氧基甲基)。新型的2-叠氮基1,4-萘醌的区域选择性烯丙氧基化/克莱森重排提供了进入高度氧化的萘萘沙林片段的途径。