Electrochemical Allylation Reactions of Simple Imines in Aqueous Solution Mediated by Nanoscale Zinc Architectures
作者:Jing-Mei Huang、Xu-Xiao Wang、Yi Dong
DOI:10.1002/anie.201004852
日期:2011.1.24
I zinc we're alone now: The title reactions were achieved in an undivided cell fitted with a pair of zinc electrodes in aqueoussolution. A preliminary study on the relationship of reaction activity and surface morphology showed that the deposited zinc powders with nanoscale architectures had very high activity.
Enantioselective synthesis of homoallylic amines. Evidence of reversible addition of allylzinc bromide to aromatic imines derived from (S)-valine methyl ester and (S)-valinol
The reaction of aromatic and aliphatic imines derived from (S)-valine methyl ester and (S)-valinol with allyl bromide and zinc in tetrahydrofuran affords homoallylic amines with up to 100% diastereoisomeric excess (d.e.), but in the case of the aromatic imines the diastereoselectivity is lowered by increasing the reaction time, owing to the reversibility of the allylation reaction.
Preparation of Both Diastereomers of Homoallylic Amines by Allylmetalation of Methyl <i>N</i>-Benzylidene-(<i>S</i>)-valinate
作者:Ashraf A. El-Shehawy、Mahmoud A. Omara、Koichi Ito、Shinichi Itsuno
DOI:10.1055/s-1998-1681
日期:1998.4
The reaction of enantiopure imine 1 with methallyl or prenylzinc reagents affords homoallylic amines having (S,S) configuration with up to 100% diastereomeric excess. Another diastereomer, (R,S)-amines, is obtained from the same imine 1 by using allylboron reagents.
A simple and efficient one-pot method was developed to give chiral homoallylic amines and aminoacidsfrom the respective aldehydes in high stereoselectivity.