The influence of conformational restriction in the C-terminus of growth hormone secretagogues on their potency
作者:Bernd Peschke、Michael Ankersen、Michael Bauer、Thomas Kruse Hansen、Birgit Sehested Hansen、Karin Kramer Nielsen、Kirsten Raun、Lutz Richter、Lisbet Westergaard
DOI:10.1016/s0223-5234(02)01370-3
日期:2002.6
in order to obtain more potent growth hormone secretagogues, a comparison of ipamorelin and NN703 suggested the addition of a polar group at the C-terminus of NN703. A study was conducted using constrained amines for this purpose. Here, substituted 4-piperidinylamino- and 4-dimethylaminopiperidino-substitutents were found to give the most active compounds. A replacement of the 4-dimethylaminopiperidino-substituent with 4-hydroxypiperidino resulted in a series of compounds, which showed in vitro activity with EC50 values in the low nanomolar range, and favourable kinetic properties, such as 40% oral bioavailability. The most promising compound was also tested in a swine in vivo model, resulting in a growth hormone level with a C-max of over 40 ng mL(-1). (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved..