Total Synthesis of WS9326A, a Potent Tachykinin Antagonist from Streptomyces violaceoniger.
作者:Nobuharu SHIGEMATSU、Natsuko KAYAKIRI、Satoshi OKADA、Hirokazu TANAKA
DOI:10.1248/cpb.45.236
日期:——
Total synthesis of the cyclic peptide lactone WS9326A, a potent tachykinin antagonist isolated from Streptomyces violaceoniger strain 9326, has been achieved via Cbz-Thr(Boc-allo-Thr-Asn-Ser(Bzl)-(E)delta MeTyr-Leu-D-Phe-OTce, which was cyclized (Phe and allo-Thr) using an active ester method with N-hydroxysuccinimide. Finally the unique N-acyl group, the 2-(1(Z)-pentenyl)cinnamoyl moiety, was introduced
已通过Cbz-Thr(Boc-allo-Thr-Asn-Ser(Bzl)-(E)delta MeTyr-Leu-D实现了从肽链霉菌9326分离的强力速激肽拮抗剂环肽内酯WS9326A的全合成。 -Phe-OTce,通过活性酯法与N-羟基琥珀酰亚胺环化(Phe和allo-Thr),最后将独特的N-酰基(2-(1(Z)-戊烯基)肉桂酰基)引入合成的关键步骤包括制备脱氢-N-甲基酪氨酸(δMeTyr)单元的E-异构体,β-和β-异构体的苏-和赤-异构体的脱苯甲酰化反应苯甲氧基-N-甲基酪氨酸衍生物仅给出Cbz-Thr-δMeTyr(MOM)-OMe的Z-异构体,然后在随后的步骤中通过Cbz-Thr(TBDMS)-(Z)δMeTyr(MOM)-Leu-D-Phe-OTce的光化学异构化将其转化为所需的E-异构体。