Synthesis of a constrained enkephalin analog to illustrate a novel route to the piperazinone ring structure
作者:Kevin Shreder、Li Zhang、Murray Goodman
DOI:10.1016/s0040-4039(97)10530-5
日期:1998.1
The synthesis of a constrained, piperazinone analog of Leu-enkephalin is presented. A key step in this synthesis was the use of the secondary amine, Boc-Tyr(OtBu)Ψ[CH2NH]Gly-OMe, to ring open the β-lactone of Z-protected L-serine (the Vederas lactone). The resulting free acid was then coupled to H-Phe-Leu-OtBu in a one-pot fashion using standard carbodiimide coupling conditions. This linear precursor
介绍了Leu-脑啡肽的受限哌嗪酮类似物的合成。合成中的关键步骤是使用仲胺Boc-Tyr(O t Bu)Ψ[CH 2 NH] Gly-OMe开环Z保护的L-丝氨酸(维德拉斯内酯)的β-内酯)。然后使用标准碳二亚胺偶联条件以一锅方式将所得的游离酸偶联至H-Phe-Leu-O t Bu。该线性前体在Z基团氢解后环化以形成N 4取代的6-羧基衍生的哌嗪酮(5)。使用1:1 TFA:CH 2 Cl 2对化合物5进行脱保护,得到目标化合物1。