Intramolecular Ester Enolate–Imine Cyclization Reactions for the Asymmetric Synthesis of Polycyclic β-Lactams and Cyclic β-Amino Acid Derivatives
作者:Caroline D. Evans、Mary F. Mahon、Philip C. Andrews、James Muir、Steven D. Bull
DOI:10.1021/ol202750u
日期:2011.12.2
N-(α-methyl-p-methoxybenzyl)-ω-imino-esters undergo intramolecular cyclization reactions to afford (syn)-aza-anions of β-amino esters in high dr that cyclize to afford N-(α-methyl-p-methoxybenzyl)-β-lactams that can be readily deprotected to afford their corresponding cyclic NH-β-lactams, β-amino esters, or β-amino acids.
手性N-(α-甲基-对甲氧基苄基)-ω-亚氨基-酯的烯醇化物经历分子内环化反应,以高dr值得到β-氨基酯的(syn)-氮杂-阴离子,其环化得到N-(α-甲基p甲氧基苄基),其可容易地脱保护,得到其相应的环-β内酰胺ñ H-β内酰胺类,β-氨基酯,或β氨基酸。