5-Methyl-1-(3-pyridylcarbamoyl)-1,2,3,5-tetrahydropyrrolo[2,3-f]indole: A Novel 5-HT2C/5-HT2B Receptor Antagonist with Improved Affinity, Selectivity, and Oral Activity
作者:Ian T. Forbes、Peter Ham、Deborah H. Booth、Roger T. Martin、Mervyn Thompson、Gordon S. Baxter、Thomas P. Blackburn、Alison Glen、Guy A. Kennett、Martyn D. Wood
DOI:10.1021/jm00014a004
日期:1995.7
The preparation of a series of conformationally restricted analogues of indolylurea 1, namely tetrahydropyrroloindoles and tetrahydropyrroloquinolines, is described. The binding affinities of these compounds at 5-HT2A, 5-HT2B, and 5-HT2C receptors were determined. Of these compounds, the 1,2,3,5-tetrahydropyrrolo[2,3-f]indole derivative, compound 11, was found to have high affinity for the 5-HT2C (pK(I) 8.0) and 5-HT2B receptors (pA(2) 8.5), with excellent selectivity over the 5-HT2A and various other receptors (pK(I) <6). 11 is also considerably more active than 1 in both an in vitro functional model, 5-HT-stimulated phosphoinositol hydrolysis (pK(B) 8.8), and an in vivo functional model, mCPP-induced hypolocomotion (ID50 5.5 mg/kg po). 11 should therefore be of significant utility as a pharmacological tool to delineate the functional significance of blockade of 5-HT2B and 5-HT2C receptors.