Direct construction of a quaternary carbon center utilizing an organosamarium reagent
作者:Zhifang Li、Yongmin Zhang
DOI:10.1016/s0040-4039(01)01831-7
日期:2001.11
Direct geminal diallylation of lactams and acyclic amides containing an NH bond has been achieved in the presence of allylsamarium bromide. By applying this method, quaternary carbons have been constructed, and 2,2-diallylatednitrogenheterocycles and diallylated amides were synthesized in moderate to good yields under mild conditions.
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.
Preparation of dihomoallylic secondary amines through samarium mediated allylation of oximes
作者:Xuesen Fan、Yongmin Zhang
DOI:10.1016/s0040-4039(02)01042-0
日期:2002.7
Allylsamarium bromide adds to oximes derived from aromatic aldehydes and methyl aryl ketones at ambient temperature to afford dihomoallylic secondaryamines in moderate to high yields.
A novel chlorolactamization reaction of homoallylicamines has been developed. The treatment of homoallylicamines with dimethylzinc in chloroform led to the formation of the corresponding β-chlorolactams via the Prins-type cyclization of a carbamoyl chloride intermediate. The results of this study highlight the synthetic utility of chloroform as a source of both carbonyl group and chloride anion.