Two Trp containing peptides, neuromedins B and C, were synthesized using a new Trp derivative, Nin-mesitylenesulfonyltryptophan, [Trp (Mts)]. The thioanisole-mediated deprotection with trifluoromethanesulfonic acid in trifluoroacetic acid was employed at the final steps of these syntheses to remove the Mts group together with the Nα-protecting group. In this deprotecting step, the use of an additional scavenger, ethanedithiol, was recommended to suppress possible indole modification. When smooth-muscle contractile activity in guinea pig ileum was examined, the relative potencies of neuromedins B and C with respect to synthetic substance P (taken as 1) were 0.46 and 0.37, respectively.
我们使用一种新的 Trp 衍
生物--Nin-甲磺酰色
氨酸[Trp (Mts)]合成了两种含 Trp 的肽--神经美
多肽 B 和 C。在这些合成的最后步骤中,采用了在
三氟乙酸中用
三氟甲磺酸进行
硫代
苯甲醚介导的脱保护作用,以除去 Mts 基团和 Nα 保护基团。在这一脱保护步骤中,建议使用一种额外的清除剂乙二
硫醇来抑制可能的
吲哚修饰。在检测豚鼠回肠平滑肌的收缩活性时,与合成物质 P(取 1)相比,神经生长因子 B 和 C 的相对效力分别为 0.46 和 0.37。