Organocatalytic Enantioselective Synthesis of Pyrazolidines, Pyrazolines and Pyrazolidinones
作者:Maitane Fernández、Efraím Reyes、Jose L. Vicario、Dolores Badía、Luisa Carrillo
DOI:10.1002/adsc.201100722
日期:2012.2
Enantiopure pyrazolidines, pyrazolines and pyrazolidinones have been accessed in a direct and efficient manner through an organocatalytic, enantioselective aza-Michael/hemiaminal formation cascade process from enals and N,N′-disubstituted hydrazides. The process takes place with high regio- and stereoselectivities and furnishes the target compounds in high overall yields by means of an operationally
对映体纯的吡唑烷,吡唑啉和吡唑烷酮已经通过直接和有效的方式通过有机催化,对映选择性的氮杂-迈克尔/半乳糖形成级联过程从烯醛和N,N'-二取代的酰肼中获得。该方法以高区域选择性和立体选择性进行,并通过操作上非常简单的方法提供高总收率的目标化合物。