Chirospecific Syntheses of Conformationally Constrained 7-Azabicycloheptane Amino Acids by Transannular Alkylation
作者:Jeffrey A. Campbell、Henry Rapoport
DOI:10.1021/jo960759m
日期:1996.1.1
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,