Studies of Alicyclic α-Amino Acids. IV. Conformational Analysis of Alicyclic α-Amino Acids and Stereochemistry of the Strecker and the Bucherer Reactions
作者:YOSHIFUMI MAKI、TAKASHI MASUGI、KOJI OZEKI
DOI:10.1248/cpb.21.2466
日期:——
Conformational analysis of a pair of isomeric alicyclic α-amino acids was made by comparison of relative rates for alkaline hydrolysis of their ethyl esters. It was found that in a sharp contrast with the case of 2-norbornanone, employment of the Strecker and the Bucherer reactions in 2-bornanone resulted in the predominant formation of the corresponding amino acid possessing exo-amino and endo-carboxyl groups. On the basis of this finding, the stereochemical courses of the Strecker and the Bucherer reactions in the synthesis of alicyclic α-amino acid are also discussed.
通过比较一对异构脂环族 α-氨基酸的乙酯碱性水解的相对速率,对其进行了构象分析。结果发现,与 2-降冰片酮的情况形成鲜明对比的是,在 2-降冰片酮中使用 Strecker 反应和 Bucherer 反应会主要生成具有外氨基和内羧基的相应氨基酸。在这一发现的基础上,还讨论了在合成脂环族 α-氨基酸时,Strecker 反应和 Bucherer 反应的立体化学过程。