A Highly Stereoselective Synthesis of Chiral α-Amino-β-lactams via the Kinugasa Reaction Employing Ynamides
摘要:
A highly stereoselective synthesis of chiral alpha-amino-beta-lactam through an ynamide-Kinugasa reaction is described. In addition, a mechanistic model is illustrated here to rationalize the observed diastereoselectivity, which depends on both the initial [3 + 2] cycloaddition step and the subsequent protonation for which both are highly selective.
A Highly Stereoselective Synthesis of Chiral α-Amino-β-lactams via the Kinugasa Reaction Employing Ynamides
作者:Xuejun Zhang、Richard P. Hsung、Hongyan Li、Yu Zhang、Whitney L. Johnson、Ruth Figueroa
DOI:10.1021/ol801257j
日期:2008.8.21
A highly stereoselective synthesis of chiral alpha-amino-beta-lactam through an ynamide-Kinugasa reaction is described. In addition, a mechanistic model is illustrated here to rationalize the observed diastereoselectivity, which depends on both the initial [3 + 2] cycloaddition step and the subsequent protonation for which both are highly selective.
Asymmetric synthesis of α-keto β-lactams via [2+2] cycloaddition reaction: A concise approach to optically active (α-hydroxy β-lactams and β-alkyl(aryl)isoserines.
作者:Claudio Palomo、Jesús M. Aizpurua、José I. Miranda、Antonia Mielgo、José M. Odriozola
DOI:10.1016/s0040-4039(00)73743-9
日期:1993.9
The cycloaddition reaction of the Evans-Sjögren ketenes to imines, followed by α-hydroxylation of the resulting cycloadducts provides an efficient general asymmetric synthesis of α-keto β-lactams and derivatives.