Total synthesis of (±)-sacidumlignans D and A through Ueno–Stork radical cyclization reaction
作者:Jian-Jian Zhang、Chang-Song Yan、Yu Peng、Zhen-Biao Luo、Xiao-Bo Xu、Ya-Wen Wang
DOI:10.1039/c3ob00053b
日期:——
Efficient synthesis of (±)-sacidumlignan D (4) has been successfully achieved employing Ueno–Stork radical cyclization of α-bromo acetal 21 as a key step. Two synthetic approaches for the symmetrical diaryl ketone 19 have been discussed in detail. Notably, sacidumlignan A (1) can be also efficiently synthesized in only 7 steps with 25% overall yield, where acid triggered tandem reaction starting from
使用α-溴缩醛21的Ueno-Stork自由基环化作为关键步骤,已成功实现了(±)-saturumumlignan D(4)的高效合成。已经详细讨论了对称的二芳基酮19的两种合成方法。值得注意的是,sacidumlignan A(1)还可以仅以7个步骤有效地合成,总收率为25%,其中酸触发的串联反应(从类似的Ueno-Stork环化产物27开始)起了重要作用。此外,可以实现从(±)-saturumlignan D(4)到saturumlignan A(1)的潜在仿生转化。