Spiro-Pyrrolidine-Catalyzed Asymmetric Conjugate Addition of Hydroxylamine to Enals and 2,4-Dienals
作者:Qing-Yun Dou、Yong-Qiang Tu、Ye Zhang、Jin-Miao Tian、Fu-Min Zhang、Shao-Hua Wang
DOI:10.1002/adsc.201501025
日期:2016.3.17
A spiro‐pyrrolidine‐catalyzed tandem aza‐1,4‐addition/hemi‐acetalization reaction was developed with excellent enantioselectivity (12 examples of ≥99% ee), and several substrates proceeded with higher ee (up to 10% increase) compared with the literature data. Particularly, an interesting and unusual aza‐1,6‐/oxa‐1,4‐addition for some substrates was also observed.
螺旋吡咯烷催化的串联aza-1,4加成/半缩醛化反应具有良好的对映选择性(12例≥99%ee的实例),几种底物的ee较高(提高了10%)文献数据。特别是,还观察到一些底物有趣且不寻常的aza-1,6 / oxa-1,4-添加。