“Barbier Type” allylation of imines with allylbromide has been performed successfully by the action of aluminum (1 equiv.) and titanium(IV)chloride (0.05 equiv.) in THF. The chirality transfer of α-amino acid esters to homoallyl amines is demonstrated by allylation of N-benzalvaline methyl ester followed by alkaline hydrolysis and electrolytic decarboxylation.
Reductive addition of allyl bromide to imines has been performed with a combination of a catalytic amount of PbBr2 (0.03–0.1 equiv.) and Al (1 equiv.) in Et2O containing BF3·OEt2 (1.1 equiv).
Preparation and Reactions of Masked Allylic Organozinc Reagents
作者:Philip Jones、Paul Knochel
DOI:10.1021/jo981623m
日期:1999.1.1
Allyliczinc reagents have been prepared from sterically hindered homoallylic alcohols 10 and 13, using a novel fragmentation reaction of the corresponding zinc alkoxide, without any homocoupling products. These allyliczinc reagents react with a range of electrophiles in good to excellent yields. Substitutedallyliczinc reagents have also been prepared in this manner. alpha-Substituted homoallylic
An electroreductive “Barbier Type” allylation of imines with allylbromide has been performed in a PbBr2/Bu4NBr/THF-(Al anode)-(Pt cathode) system. A combination of Pb(0)/Pb(II) redox and a sacrificial aluminum anode works as a mediator for both cathodic and anodic electron transfer processes, respectively.
亚胺与烯丙基溴的电还原“ Barbier型”烯丙基化反应已在PbBr 2 / Bu 4 NBr / THF-(铝阳极)-(铂阴极)系统中进行。Pb(0)/ Pb(II)氧化还原和牺牲铝阳极的组合分别充当阴极和阳极电子转移过程的介体。