Organocatalytic “Difficult” Michael Reaction of Ketones with Nitrodienes Utilizing a Primary Amine-Thiourea Based on Di-tert-butyl Aspartate
作者:Michail Tsakos、Christoforos G. Kokotos
DOI:10.1002/ejoc.201101402
日期:2012.1
The primary amine–thiourea based on di-tert-butyl (S)-aspartate and (1R,2R)-1,2-diphenylethylene-1,2-diamine has been successfully employed in the “difficult” Michael reaction between aromatic ketones or acetone with nitrodienes. The high stability and reactivity of the catalyst led to improved reaction conditions. Thus, the desired products were obtained in high to excellent yields (up to 100 %) and
基于 (S)-天冬氨酸二叔丁酯和 (1R,2R)-1,2-二苯基乙烯-1,2-二胺的伯胺-硫脲已成功用于芳香酮之间的“困难”迈克尔反应或丙酮与硝基二烯。催化剂的高稳定性和反应性改善了反应条件。因此,即使在升高的温度下,也能以高至极好的产率(高达 100%)和极好的对映选择性(高达 99%)获得所需的产物。