Highly diastereoselective addition of nitromethane anion to chiral α-amidoalkylphenyl sulfones. Synthesis of optically active α-amino acid derivatives
作者:Elisabetta Foresti、Gianni Palmieri、Marino Petrini、Roberto Profeta
DOI:10.1039/b309211a
日期:——
Optically active syn-alpha-amidoalkylphenyl sulfones can be prepared from chiral aldehydes in anhydrous conditions using benzenesulfinic acid. These sulfones in basic conditions give N-acylimines that react with sodium methanenitronate to afford the corresponding nitro adducts with high anti diastereoselectivity. PM3 semiempirical calculations provide a rationale for the observed opposite stereoselectivity
可以在无水条件下使用苯亚磺酸由手性醛制备旋光的合成α-酰胺基烷基苯基砜。这些砜在碱性条件下产生N-酰亚胺,其与甲烷亚硝酸钠反应,得到具有高抗非对映选择性的相应硝基加合物。PM3半经验计算为观察到的相反立体选择性提供了理论依据。所得的硝基衍生物进行Nef反应,随后进行甲基化,以良好的收率得到光学活性的β-羟基-α-氨基酸和α,β-二氨基酸酯。这些氨基酸衍生物是制备生物活性化合物的重要组成部分。