Using solid phase synthesis we prepared the cholecystokinin fragment Boc-CCK-7 (Boc-Tyr(SO3-Na+)-Met-Gly-Trp-Met-Asp-Phe-NH2) Ia and its seven analogues Ib - Ih. In the analogues Ib and Ic the Met residue in the carboxyterminal part of the molecule was substituted for L- or D-Phe Me3. In the analogues Id and Ie with Phe residue substituted by L- or D-Phe Me3 the Neo was inserted in the place of this Met residue and in the analogues If and Ig, an addition to PheMe3 substitution in the carboxyterminus, both Met residues were replaced for Neo. This dual substitution for Met residues was also applied in the analogue Ih with coded Phe residue in the C-terminus.
使用固相合成,我们制备了胆囊收缩素片段Boc-CCK-7(Boc-Tyr(SO3- Na+)-Met-Gly-Trp-Met-Asp-Phe-NH2)Ia及其七个类似物Ib - Ih。在类似物Ib和Ic中,分子的羧基末端部分的Met残基被L-或D-Phe Me3替代。在通过L-或D-Phe Me3替代Phe残基的类似物Id和Ie中,Neo被插入到这个Met残基的位置,并且在类似物If和Ig中,除了PheMe3替代羧基末端外,两个Met残基都被Neo替换。这种对Met残基的双重替代也应用于带有编码Phe残基的C-末端的类似物Ih中。