An Asymmetric Synthesis of the BC Ring System of 8-Epitaxoids by Way of Intramolecular Aldol and Successive Stereoselective Methylation Reactions
作者:Teruaki Mukaiyama、Isamu Shiina、Hayato Iwadare、Masahiro Saitoh、Koji Nishimura、Toshihiro Nishimura、Naoto Ohkawa、Hiroki Sakoh、Katsuyuki Saitoh
DOI:10.1246/cl.1996.483
日期:1996.6
9β-isopropylidenedioxy-8α,12,12-trimethyl-4-methylenebicyclo[6.4.0]dodecane (2)1 which corresponds to BC ring system of 8-epitaxoids was prepared in high yield form ketoaldehyde 8 via intramolecular aldol cyclization and succesive stereoselective methylation reactions. The ketoaldehyde 8 was synthesized from 8-membered ring compound 3 by stereoselective Michael addition using higher-order cuprate.
光学活性 1α-allyl-1β,11β-benzylidenedideoxy-2α,10β-bis(benzyloxy)-7β,9β-isopropylidenedioxy-8α,12,12-trimethyl-4-methylenebicyclo[6.4.0]dodecane (2)1 对应通过分子内醛醇环化和连续的立体选择性甲基化反应,以高收率形式制备了酮醛 8 的 BC 环系统 8-外延类化合物。酮醛 8 是由 8 元环化合物 3 通过立体选择性迈克尔加成使用高级铜酸盐合成的。