Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 28, Issue 4, Pages 774-777Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2017.12.069
Keywords
Orexin; OX1R antagonist; YNT-707; 4,5-Epoxymorphinan; Conformational study
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Funding
- JSPS KAKENHI [15K16557, 16H05098]
- MEXT [JP15H05942, 17H06049]
- TORAY Industries, Inc.
- World Premier International Research Center (WPI) Initiative, MEXT, Japan
- Grants-in-Aid for Scientific Research [17H06095, 15H05942, 17H06049, 16H05098, 15K16557] Funding Source: KAKEN
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The 14-dehydration-and 14-H derivatives of the orexin 1 receptor (OX1R) antagonist YNT-707 (2) were synthesized. The obtained derivatives showed higher affinities for OX1R than the corresponding 14-hydroxy derivatives. The conformational analysis suggested that the 17-sulfonamide groups in the derivatives without the 14-hydroxy group have a greater tendency to be oriented toward the upper side of the D-ring compared with the 14-hydroxy derivatives. Additionally, the 14-dehydration-derivative with 6a-amide side chain showed significantly higher affinity than the 14-hydroxy derivative, while the corresponding 14-H derivative showed only slightly higher affinity. Thus, the 14-hydroxy group strongly affects the affinity of the antagonist for the OX1R. (C) 2018 Elsevier Ltd. All rights reserved.
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