作者:Jinhua J. Song、Zhulin Tan、Jonathan T. Reeves、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/ol0630494
日期:2007.3.1
N-Heterocyclic carbenes were shown to be highly effective catalysts to promote Mukaiyama aldol reactions. In the presence of only 0.5 mol % of N-heterocyclic carbene (5), various aldehydes and 2,2,2-trifluoroacetophenone underwent Mukaiyama aldol reactions in THF with trimethylsilyl ketene acetal (2) at 23 degrees C as well as with trimethylsilyl enol ether (7) at 0 degrees C to afford aldol adducts in good yields. These conditions are extremely mild and operationally simple and tolerate various functional groups.
Mukaiyama Aldol Reactions Catalyzed by a Trimeric Organo Aluminum(III) Alkoxide
作者:So Han Kim、Sungwoo Yoon、Youngjo Kim、John G. Verkade