Palladium-Catalyzed Asymmetric [3+2] Cycloaddition of Trimethylenemethane with Imines
作者:Barry M. Trost、Steven M. Silverman、James P. Stambuli
DOI:10.1021/ja0753389
日期:2007.10.1
The transition metal-catalyzed trimethylenemethane [3+2] cycloaddition provides a direct route to functionalized heterocycles. Herein, we describe a catalytic, asymmetric protocol for the reaction between 3-acetoxy-2-trimethylsilylmethyl-1-propene and various imines. The corresponding pyrrolidines were obtained in excellent yields and enantioselectivities making use of the novel phosphoramidite L10
An Efficient and Diastereoselective Synthesis of <i>trans</i> β-Lactams and β-Aminocarbonyl Compounds
作者:Yan-Guang Wang、Shan-Zhong Jian、Cheng Ma
DOI:10.1055/s-2005-861803
日期:——
Efficient and diastereoselective syntheses of trans β-lactams and anti β-aminocarbonyl compounds from carboximide 1 and imines 2 under the classical Reformatsky reaction conditions are described. An enolate-imine mechanism has been proposed for this reaction.
β-Amino esters via the Reformatsky reaction: Restraining effects of the ortho-methoxyphenyl substituent
作者:James C. Adrian、Julia L. Barkin、Lamyaa Hassib
DOI:10.1016/s0040-4039(99)00248-8
日期:1999.3
β-Amino esters are, in most cases, the only products of the Reformatskyreaction in CH2Cl2 between (methoxycarbonyl)methyl zinc bromide (prepared in-situ) and imines prepared from either an aryl or alkyl aldehyde and o-anisdine (Scheme 2). Restraining properties of the ortho-methoxyphenyl group, which lead to sole formation of the β-amino ester, are ascribed to the inductive effect of the ortho-methoxy
Enantioselective Synthesis of Propargylamines through Zr-Catalyzed Addition of Mixed Alkynylzinc Reagents to Arylimines
作者:John F. Traverse、Amir H. Hoveyda、Marc L. Snapper
DOI:10.1021/ol035138b
日期:2003.9.1
[reaction: see text] Addition of mixed alkynylzinc reagents to various arylimines is catalyzed by chiral amino acid-based ligand 1 and Zr(Oi-Pr)(4).HOi-Pr to afford chiral propargylamines in up to 90% ee. Oxidative removal of the o-anisidyl group affords the free amine, which can then be acylated.