A new and efficient synthetic protocol for the preparation of unsymmetrical difunctionalized cyclen and its close derivatives using a modified Ugi reaction (N-split Ugi) is described. The scope of this methodology is further extended by the successful use of various isocyanides, highly functionalized carboxylic acids, and aldehydes.
A Passerini/Michael Pathway towards Butyrolactones
作者:Shuanglong Jia、Laurent El Kaïm
DOI:10.1002/ejoc.201800958
日期:2018.12.13
adducts of aromatic and heteroaromatic aldehydes was developed. This strategy significantly expands the scope of the butyrolactones syntheses from benzoinderivatives with microwave conditions allowing to counterbalance the poorer electron‐withdrawing group effect of the amide moiety.