Synthetic Study on Pactamycin: Stereoselective Synthesis of the Cyclopentane Core Framework
作者:Atsumi Goto、Satoshi Yoshimura、Yuta Nakao、Makoto Inai、Tomohiro Asakawa、Masahiro Egi、Yoshitaka Hamashima、Mitsuru Kondo、Toshiyuki Kan
DOI:10.1021/acs.orglett.7b01257
日期:2017.7.7
The cyclopentane core framework 23 of pactamycin (1) was synthesized in 14 steps from symmetric cyclohexadiene 11. Our synthetic strategy features Rh-mediated catalytic desymmetrization of 10 via aziridination and then regioselective ring-opening reaction of sulfonylaziridine 9 with NaN3, ring-contraction of cyclohexene 14 by ozonolysis followed by intramolecular aldol reaction, and stereoselective
pactamycin(1)的环戊烷核心骨架23是由对称的环己二烯11分14步合成的。我们的合成策略设有铑介导的催化desymmetrization 10经由氮杂环丙烷和sulfonylaziridine的再区域选择性开环反应9用的NaN 3,环己烯的环收缩14通过臭氧分解,接着通过分子内醛醇缩合反应,并通过顺序四取代的碳原子的立体结构二羟基化和甲基化反应。通过库尔修斯重排和随后的氨基甲酰胺形成胺在四取代碳上的立体定向结合。