作者:Timothy I. Richardson、Scott D. Rychnovsky
DOI:10.1021/jo960218x
日期:1996.1.1
The stereochemical configuration of filipin III (1) was determined using the (13)C acetonide analysis. The relative configurations for the nine stereogenic centers in the top half of filipin were initially identified using just three acetonide derivatives (2, 3, and 4) arising from a two-step protection sequence. The structure was confirmed by synthesis and direct correlation of degradation products
菲律宾三(1)的立体化学构型是使用(13)C丙酮化物分析法确定的。最初仅使用由两步保护序列产生的三个丙酮化物衍生物(2、3和4)来确定在菲律宾素上半部的9个立体异构中心的相对构型。通过降解产物8(C26-C28)和10(C1-C16)的合成和直接相关来确认结构。菲律宾四丙酮化物2和三丙酮化物4各自以非常不寻常的椅子构型含有抗丙酮化物。分子建模成功地再现了椅子构型比通常更稳定的扭转舟构型的偏好。