Synthesis of the Norjatrophane Diterpene (−)-15-Acetyl-3-propionyl- 17-norcharaciol
作者:Hannes Helmboldt、Daniel Köhler、Martin Hiersemann
DOI:10.1021/ol060115t
日期:2006.4.1
[reaction: see text] A scalable enantioselective synthesis of the nonnatural 17-norjatrophane diterpene 3-propionyl-15-acetyl-17-norcharaciol is described. Key C/C-connecting transformations are an Evans aldol reaction, an intramolecular carbonyl ene reaction, a Horner-Wadsworth-Emmons olefination, and a ring-closing metathesis for the formation of a 12-membered carbacycle.
[反应:见正文]描述了非天然的17-去甲伞烷二萜3-丙酰基-15-乙酰基-17-去甲萘酚的可扩展对映选择性合成。关键的C / C连接转化是Evans醛醇缩合反应,分子内羰基烯反应,Horner-Wadsworth-Emmons烯化反应以及用于形成12元碳环的闭环复分解反应。