Synthesis of Planar-Chiral Paracyclophanes via Samarium(II)-Catalyzed Intramolecular Pinacol Coupling
作者:Tsuyoshi Ueda、Nobuhiro Kanomata、Hajime Machida
DOI:10.1021/ol0506258
日期:2005.6.1
[reaction: see text] A series of [n]paracyclophanediols (n = 8-12) was synthesized by samarium-catalyzed pinacol coupling for their ansa-bridge formation. Enantiomerically pure [n]paracyclophane esters were derived from the diols in a several steps via chiral resolution (for n = 10) or via crystallization-induced asymmetric transformation (for n = 11) by using amino alcohol auxiliaries and their selective
[反应:见正文]通过sa催化的频哪醇偶联反应合成了一系列[n]对环庚二醇(n = 8-12)以形成ansa桥。通过使用氨基醇助剂及其选择性裂解,通过手性拆分(对于n = 10)或通过结晶诱导的不对称转化(对于n = 11),可以通过几个步骤从二醇中衍生出对映体纯的[n]对环环烷酸酯。