Cation-stabilizing auxiliaries in polyene cyclizations. 5. The fluorine atom as a cation-stabilizing auxiliary in biomimetic polyene cyclizations. 2. Asymmetric synthesis of a steroid
作者:William S. Johnson、Vernon R. Fletcher、Balan Chenera、William R. Bartlett、Fook S. Tham、Rudolph K. Kullnig
DOI:10.1021/ja00055a020
日期:1993.1
The use of the fluorine atom an a cation-stabilizing (C-S) auxiliary for enhancing polyene cyclization has been improved in synthetic effectiveness by the demonstration that an acetal 5 can be converted to a racemic fluorocycle, bearing the natural backbone configuration of the steroids
通过证明缩醛 5 可以转化为外消旋氟环,具有类固醇的天然骨架构型,氟原子作为阳离子稳定 (CS) 助剂用于增强多烯环化在合成效率方面得到了提高