| 摘要 |
<p>A process for the preparation of a compound of the formula (II) or a salt thereof; wherein R2 and R3 are independently selected from arginine protecting groups; and R1 is hydrogen or a protecting group for an amino group of an acetamide moiety: which process comprises coupling a carboxylic acid of the formula (V) or a salt thereof; wherein R2 is as defined above with an amine of formula (VI) as defined in the application or a salt thereof. Also claimed are intermediates used in the process and the processes for the preparation of the intermediates.</p> |
