The synthesis of methyl (2S,4R)-4-(benzyloxy)-N-(2,2-dimethyl-2H-azirin-3-yl)prolinate (10), a novel 2H-azirin-3-amine ('3-amino-2H-azirine'), is described (Scheme 1). The reaction of methyl (2S,4R)-N-(2- methylpropanoyl)-4-(benzyloxy)prolinate (7) with Lawesson reagent gave methyl (2S,4R)-4-(benzyloxy)-N-[2-(methylthio)propanoyl]prolinate (8) and consecutive treatment with COCl2, 1,4-diazabicyclo[2
(2S,4R)-4-(苄氧基)-N-(2,2-二甲基-2H-azirin-3-yl)脯
氨酸甲酯(10)的合成,一种新型2H-azirin-3-amine ('3 -
氨基-2H-
氮杂环丙烷'),描述(方案1)。(2S,4R)-N-(2-甲基丙酰基)-4-(苄氧基)脯
氨酸甲酯(7)与
劳森试剂反应得到(2S,4R)-4-(苄氧基)-N-[2-(甲
硫基)丙酰基]脯
氨酸 (8) 和 COCl2、1,4-二氮杂
双环[2.2.2]辛烷 (
DABCO) 和 NaN3 连续处理得到 10。使用 10 作为二肽 Aib-Hyp ( Aib = 2-
氨基
异丁酸,Hyp = (2S,4R)-
4-羟基脯
氨酸)由几种模型肽的合成证明(方案 2 和表)。模型肽中 Hyp 中 4-OH 功能的苄基保护基团已以良好的收率去除。