Direct construction of quaternary carbon center utilizing an allylsamarium bromide reagent
作者:Zhifang Li、Yongmin Zhang
DOI:10.1016/s0040-4020(02)00491-x
日期:2002.6
Direct geminal diallylation of lactones, lactams and acyclic amides containing a N–H bond has been achieved in the presence of allylsamarium bromide. By applying this method, quaternary carbons have been constructed, and 2,2-diallylated cyclic ethers, 2,2-diallylatednitrogenheterocycles and diallylated amides were synthesized in moderate to good yields under mild conditions.
Diaminophosphine Oxide Ligand Enabled Asymmetric Nickel-Catalyzed Hydrocarbamoylations of Alkenes
作者:Pavel A. Donets、Nicolai Cramer
DOI:10.1021/ja406730t
日期:2013.8.14
Chiral trivalent phosphorus species are the dominant class of ligands and the key controlling element in asymmetric homogeneous transition-metalcatalysis. Here, novel chiral diaminophosphine oxide ligands are described. The arising catalyst system with nickel(0) and trimethylaluminum efficiently activates formamide C-H bonds under mild conditions providing pyrrolidones via intramolecular hydrocarbamoylation
Lactams containing an N-H bond are smoothly transformed into 2,2-diallylatednitrogenheterocycles on heating with allylic boranes in THF followed by deboronation