Studies on peptides. CXXIX. Application of Nin-mesitylenesulfonyltryptophan for the syntheses of neuromedin B and neuromedin C.
作者:NOBUTAKA FUJII、SHIROH FUTAKI、KENICHI AKAJI、HARUAKI YAJIMA、ATSUKO INOUE、TOMIO SEGAWA
DOI:10.1248/cpb.33.3731
日期:——
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。