reconstruction approach to structurally unique 13(14→8),14(8→7)diabeo-steroid swinhoeisterol A was developed. The conversion of an ergostane skeleton proceeded through the intermediacy of a 13(14→8)abeo-framework as present in the dankasterone and periconiastone family of natural products and features a β scission of a 14-alkoxy radical with concomitant generation of the C8-C13 bond. From this intermediate
开发了一种用于结构独特的 13(14→8),14(8→7)diabeo-steroid swinhoeisterol A 的可切换自由基框架重建方法。麦角甾烷骨架的转化是通过 13(14→8)abeo 框架的中间体进行的,这些框架存在于
天然产物丹卡甾酮和周石酮家族中,其特征是 14-烷氧基自由基的 β 断裂伴随 C8- C13 键。从这个中间体开始,根据所采用的条件,级联继续进行 Dowd-Beckwith 重排,并导致形成
天然产物 swinhoeisterol 类的 13(14→8),14(8→7)diabeo 框架. 然后,这些框架的合成允许有效地获得 swinhoeisterol A (1)、dankasterone A (Δ4-2)、dankasterone B (2) 和 periconiastone A (3)。