presence of another equivalent of a primary amine or ammonia. Achievable yields of the amides 10, 12 were moderate to good (27–59%, 12–48%), while the corresponding esters 9 could only be obtained in poor yields (4–14%). The new α-amino acidamides are surprisingly stable, and they can be incorporated into small peptides as demonstrated with the preparation of the glycine 13e and the spirocyclopro-paneoxazoline
氮杂螺戊烷甲酰胺 10 和 12 通过在四氢呋喃中加入伯胺,然后在四氢呋喃中用氢化钠/三乙胺处理,在一锅法中通过两步操作从 2-氯-2-环亚丙基乙酸甲酯 (4) 中非常容易地形成另一当量的伯胺或氨。酰胺 10、12 的可实现产率中等至良好(27-59%、12-48%),而相应的酯 9 只能以较差的产率(4-14%)获得。新的 α-氨基酸酰胺出人意料地稳定,它们可以掺入小肽中,如甘氨酸 13e 和螺环丙-泛恶唑啉衍生物 14e 的制备所证明的那样。