Efficient One-Step Synthesis of Bis-Spiroketals from Diynediols by π-Lewis Acid-Catalyzed Hydroalkoxylation/Hydration
作者:Ivan Volchkov、Kamlesh Sharma、Eun Jin Cho、Daesung Lee
DOI:10.1002/asia.201100131
日期:2011.8.1
Spiroling out of control: An efficient one‐step synthesis of 5‐5‐5, 5‐5‐6, and 6‐5‐6 bis‐spiroketals from 4,6‐diyne‐1,n‐diols and 5,7‐diyne‐1,n‐diols has been developed with good yields. A mixture of cis‐ and trans‐bis‐spiroketals were generally obtained from each substrate and the isolated cis‐ and trans‐bis‐spiroketals undergo interconversion to reach their equilibrium composition (see scheme).
失控旋转:由4,6-二炔-1,正二醇和5,7-二醇有效合成5-5-5、5-6和6-5-6双螺缩酮二炔-1,n-二醇的开发具有良好的收率。通常从每种底物中获得顺式和反式双螺酮混合物,分离出的顺式和反式双螺酮混合物进行相互转化以达到其平衡组成(参见方案)。