作者:Yujiro Hayashi、Mitsuru Shoji、Junichiro Yamaguchi、Kenji Sato、Shinpei Yamaguchi、Takasuke Mukaiyama、Ken Sakai、Yukihiro Asami、Hideaki Kakeya、Hiroyuki Osada
DOI:10.1021/ja0276826
日期:2002.10.1
The asymmetric total synthesis of (-)-azaspirene, an angiogenesis inhibitor, has been accomplished, establishing its absolute stereochemistry. The key steps are a MgBr2.OEt2-mediated, diastereoselective Mukaiyama aldol reaction, a NaH-promoted, intramolecular cyclization of an alkynylamide, and the aldol reaction of a ketone containing functionalized gamma-lactam moiety without protection of tert-alcohol
(-)-氮杂紫杉烯(一种血管生成抑制剂)的不对称全合成已经完成,确立了其绝对立体化学。关键步骤是 MgBr2.OEt2 介导的非对映选择性 Mukaiyama 羟醛反应、NaH 促进的炔酰胺分子内环化,以及含有官能化 γ-内酰胺部分的酮的羟醛反应,没有叔醇和酰胺官能团的保护。