A tetrapeptide type-B CCK receptor ligand of the formula
A-B-C-D
or a pharmaceutically acceptable salt thereof, which is useful for treating central nervous system disorders, substance abuse, gastrointestinal disorders, endocrine disorders, eating-related disorders and treatment of shock, respiratory and cardiocirculatory insufficiencies.
Conformationally Constrained Amino Acids.<sup>1</sup>on the Synthesis of 4-Substituted 8-Membered Cyclic Tryptophan Derivatives
作者:John Y. L. Chung、James T. Wasicak、Alex M. Nadzan
DOI:10.1080/00397919208019295
日期:1992.4
Abstract The thermal lactamization of 4-(carboethoxy)-methyl-tryptophan ethyl ester (5), prepared from 4-(carboethoxy)methyl-indole 3 via Gilchrist′s method, in refluxing xylene followed by saponification provided the 8-membered cyclic tryptophan derivative 1. Selective reduction of lactam 6 via the iminium ion 9 furnished the cyclic tryptophan derivative 2