Total Synthesis of (+)-Myriocin and (−)-Sphingofungin E from Aldohexoses Using Overman Rearrangement as the Key Reaction
作者:Takeshi Oishi、Koji Ando、Kenjin Inomiya、Hideyuki Sato、Masatoshi Iida、Noritaka Chida
DOI:10.1246/bcsj.75.1927
日期:2002.9
effectively generated the tetrasubstituted carbon with nitrogen, and subsequent Wittig olefination afforded the highly functionalized moiety 3 of myriocin stereoselectively. Sulfone-mediated coupling reaction of the allyl bromide 3 with C12 hydrophobic part 4 successfully constructed the carbon framework possessing E-olefin 28. Removal of the sulfone and protecting groups completed the chiral and stereoselective
描述了从天然存在的 α-取代的 α-氨基酸、(+)-myriocin (1) 和 (-)-sphingofungin E (2) 的己醛糖开始的全合成。衍生自 D-甘露糖的烯丙基三氯乙酰亚胺酸酯 6E 的 Overman 重排有效地产生了四取代的碳和氮,随后的 Wittig 烯化以立体选择性提供了高度官能化的 myriocin 部分 3。烯丙基溴 3 与 C12 疏水部分 4 的砜介导偶联反应成功构建了具有 E-烯烃 28 的碳骨架。去除砜和保护基团完成了 (+)-myriocin (1) 的手性和立体选择性全合成。从 D-葡萄糖开始的类似转化也完成了 (-)-鞘氨醇 E (2) 的全合成。