A Novel Cyclopentene Annulation Method Based on Conjugate Addition Reactions of α-Cyano Carbanion Species
作者:Keiji Tanino、Yoshihide Tomata、Yasuhiro Shiina、Masaaki Miyashita
DOI:10.1002/ejoc.200500759
日期:2006.1
A new cyclopentene annulation method based on a conjugate addition reaction with 4-methoxybut-3-enenitrile was developed. Treatment of a cyclic enone with the potassium carbanion of the nitrile followed by acetic anhydride afforded an enol acetate, which underwent an HCl-mediated intramolecular cyclization reaction to yield a bicyclo[n.3.0]alkenone derivative in good yield. A lipase-mediated optical
基于与4-甲氧基丁-3-烯腈的共轭加成反应,开发了一种新的环戊烯环化方法。用腈的碳负离子钾和乙酸酐处理环烯酮得到烯醇乙酸酯,其经历 HCl 介导的分子内环化反应,以良好的收率得到双环 [n.3.0] 烯酮衍生物。脂肪酶介导的环化产物光学拆分为类固醇和其他天然化合物提供了新的手性构件。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)