Chiral Heterospirocyclic 2H-Azirin-3-amines as Synthons for 3-Amino-2,3,4,5-tetrahydrofuran-3-carboxylic Acid and Their Use in Peptide Synthesis
作者:Simon Stamm、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200390124
日期:2003.5
mixtures of the N-benzoyl dipeptides 15 and 16, respectively (Scheme 3). The latter were separated chromatographically. The configurations and solid-state conformations of all six benzamides were determined by X-ray crystallography. With the aim of examining the use of the new synthons in peptide synthesis, the reactions of 7 with Z-Leu-Aib-OH to yield a tetrapeptide 17 (Scheme 4), and of 6 with Z-Ala-OH
所述heterospirocyclic Ñ甲基ñ -苯基-5-氧杂-1-氮杂螺[2.4]庚-1-简-2-胺(6)和ñ - (5-氧杂-1-氮杂螺[2.4]庚-1-烯-2-基) - (小号) -脯氨酸甲酯(7)从相应的杂环硫代甲酰胺合成12和10,分别由氯化钴与连续治疗2,1,4-二氮杂双环[2.2.2]辛烷, NaN 3(方案1和2)。这些2 H -azirin-3-胺与硫代苯甲酸和苯甲酸反应,得到外消旋苯甲酰胺13和14,和分别为N-苯甲酰基二肽15和16的非对映异构体混合物(方案3)。后者经色谱分离。通过X射线晶体学测定所有六个苯甲酰胺的构型和固态构象。为了检验新合成子在肽合成中的用途,7与Z-Leu-Aib-OH的反应生成四肽17(流程4),6与Z-Ala-OH的反应生成二肽。18(方案5)进行。通过MPLC或HPLC分离得到的非对映异构体。核磁共振研究溶剂依赖性的NH共振的化学位移