A new method is reported for the chirospecific preparation of optically pure 1-carboxy-7-azabicycloheptane amino acids for the generation of peptidomimetics as conformational probes. The method allows for the multigram preparation of these amino acid analogues through use of a thiolactam sulfide contraction and a transannular alkylation sequence as the key C-C bond-forming steps, starting from L-glutamic
报道了一种新的方法,用于光学纯的1-羧基-7-氮杂双
环庚烷氨基酸的手性制备,以产生拟肽作为构象探针。所述方法允许通过使用
硫代内酰胺
硫化物收缩和跨环烷基化序列作为关键的CC键形成步骤,从
L-谷氨酸开始,对这些
氨基酸类似物进行多谱图制备。该路线提供了通往两个常见中间体的途径,即7-(苄氧羰基)-1-羧基-7-
氮杂双环[2.2.1] -3-
庚烷和(1S,4R)-7-(苄氧羰基)-1-羧基-7-
氮杂双环[2.2.1] -
3-庚酮叔丁酯,分别用于修饰对称和手性
氨基酸同源物。后者中间体的C-1羧基单元的脱羧也证明该方法适用于短时,