Endo-Selective Enyne Ring-Closing Metathesis Promoted by Stereogenic-at-W Mono-Pyrrolide Complexes
摘要:
The utility of W-alkylidene complexes for enyne ring-closing metathesis is demonstrated in a direct comparison with Mo-based analogs. Tungsten complexes lead to less alkyne oligomerization and higher levels of endo-selectivity and enantioselectivity.
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.
Synthesis of Homoallylamines by the Addition of Allylic Indium Reagents to Azomethines and Nitriles
作者:Shun-Ji Jin、Shuki Araki、Yasuo Butsugan
DOI:10.1246/bcsj.66.1528
日期:1993.5
Triallyldiindium trihalides and allylindate(1-)s reacted with N-benzylideneamines regioselectively at the C-3 carbon on the allyl group to give high yields of homoallylic secondary amines. Primary amines were obtained by the action of an excess of allylic indates on aromatic nitriles.