Studies on peptides. XCV. Alternative synthesis of porcine vasoactive intestinal polypeptide (VIP).
作者:MASAHARU TAKEYAMA、KANAME KOYAMA、KAZUTOMO INOUE、TAMOTSU KAWANO、ADACHI HIDEKI、TAKAYOSHI TOBE、HARUAKI YAJIMA
DOI:10.1248/cpb.28.1873
日期:——
Two alternative deprotecting procedures were employed for the synthesis of porcine vasoactive intestinal polypeptide (VIP). Besides HF, TFA-thioanisole was found to cleave all the protecting groups employed, Z, Bzl and Mts, suppressing a newly found side reaction, i.e., acid-catalyzed succinimide formation from Asp residues with the free carboxyl group. A small amount of the N-terminal His residue linked to Ser-Asp was found to be released on standing at pH 6.
猪血管活性肠肽(VIP)的合成采用了两种不同的脱保护程序。除了氢氟酸外,发现TFA-硫代茴香醚能裂解所用的所有保护基团,包括苄酯、甲砷酸和三甲基硅基,并抑制了一种新发现的副反应,即自由羧基的天冬氨酸残基在酸性催化下形成琥珀酰亚胺。在pH 6下静置时,与Ser-Asp相连的N端组氨酸残基有少量被释放。