New synthetic routes to α-amino acids and γ-oxygenated α-amino acids. Reductive denitration and oxidative transformations of γ-nitro-α-amino acids
作者:Maxwell J. Crossley、Yik M. Fung、Efstathia Kyriakopoulos、Jeffrey J. Potter
DOI:10.1039/a707067e
日期:——
Transformation of γ-nitro-α-amino acid derivatives into α-amino acids by reductive denitration, into the γ-oxo-α-amino acids by ozonolysis of the corresponding amino acid ester nitronate derivatives, and into γ-hydroxy-α-amino acid derivatives by subsequent reduction of the oxo functionality, can be achieved in good yields. As the γ-nitro-α-amino acid derivatives are prepared from N,O-protected dehydroalanines derivable from the corresponding alanine, serine and cysteine derivatives by specific routes, the overall procedures provide a means for selective conversion of these simple α-amino acids into more complex ones.
通过还原去硝化,γ-硝基-α-氨基酸衍生物可以转化为α-氨基酸;通过对应氨基酸酯硝酸盐衍生物的臭氧解聚,可以转化为γ-氧-α-氨基酸;而通过随后的氧功能团还原,可以转化为γ-羟基-α-氨基酸衍生物,这些转化反应均能获得较高的产率。由于γ-硝基-α-氨基酸衍生物是从N,O保护的脱氢丙氨酸制备而成,而后者又是通过特定途径从相应的丙氨酸、丝氨酸和半胱氨酸衍生物得到的,因此整体程序提供了一种选择性将这些简单的α-氨基酸转化为更复杂的氨基酸的方法。