Direct synthesis of β<sup>2,3</sup>‐amino acid from β‐hydroxycarbamides: Implication in the synthesis of azumamide analogs and conformational analysis
作者:Afsar Ali Khan、Jayanti Vaishnav、Manoj Kumar Gangwar、Ravi Sankar Ampapathi、Dipankar Koley
DOI:10.1002/jhet.4717
日期:2023.11
The designed β2,3 unnatural amino acids have been synthesized from α-methyl-β-hydroxycarbamides via direct azidation without obtaining eliminated products. Furthermore, these β2,3 amino acids were utilized to synthesize cyclic tetrapeptides (CTPs) as azumamide analogs. 2D-NMR analysis revealed the compact secondary structure as a single conformer. Presence of intramolecular H-bonding in CTPs was observed
所设计的β 2,3非天然氨基酸是由α-甲基-β-羟基脲通过直接叠氮化合成的,没有获得消除的产物。此外,这些 β2,3氨基酸被用来合成环状四肽(CTP)作为 azumamide 类似物。二维核磁共振分析揭示了紧凑的二级结构为单一构象异构体。在这种 α 3 β 2,3结构中观察到 CTP 中存在分子内氢键,并显示出七元 γ 转角结构。