for preparation of allylic zirconium reagents directly from 1-alkenes via zirconocene−olefin complex has been developed. Selective transfer of the hydride of zirconocene allyl hydride complex, a tautomer of zirconocene−olefin complex, to diisopropyl ketone generates the corresponding zirconocene alkoxide allyl. The allylic zirconium reagents formed effects stereoselective allylation of aldehyde at 25
Synthesis, structure and catalytic activity of an air-stable titanium triflate, supported by an amine tris(phenolate) ligand
作者:Steven D. Bull、Matthew G. Davidson、Andrew L. Johnson、Diane E. J. E. Robinson、Mary F. Mahon
DOI:10.1039/b304704k
日期:——
An air- and moisture-stable titanium(IV) triflate, 3, supported by a C3-symmetric amine tris(phenolate) ligand has been synthesised, characterised by X-ray crystallography and demonstrated to be an excellent catalyst for formal aza-Diels–Alder reactions.
已经合成了由 C3 对称胺三(酚盐)配体负载的对空气和水分稳定的三氟甲磺酸钛(IV)3,通过 X 射线晶体学表征,并证明它是形式 aza-Diels 的优良催化剂–桤木反应。
Allylation of Imines with in situ Generated Allyl Lead Reagents in a PbBr<sub>2</sub>/Al/BF<sub>3</sub>·OEt<sub>2</sub>/Et<sub>2</sub>O System
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
Reductivedimerization of -alkylimines into vicinal diamines has been performed by the action of a catalytic amount of lead(II) bromide and aluminum (1 equiv.) in THF containing trifluoroacetic acid (TFA) or aluminum(III) bromide.