3-(4-Fluoropiperidin-3-yl)-2-phenylindoles as high affinity, selective, and orally bioavailable h5-HT(2A) receptor antagonists.

Abstract:

:The development of very high affinity, selective, and bioavailable h5-HT(2A) receptor antagonists is described. By investigation of the optimal position for the basic nitrogen in a series of 2-phenyl-3-piperidylindoles, it was found that with the basic nitrogen at the 3-position of the piperidine it was not necessary to further substitute the piperidine in order to obtain good binding at h5-HT(2A) receptors. This meant the compounds no longer had high affinity at the IKr potassium channel, an issue with previous series of 2-aryl-3-(4-piperidyl)indoles. Improvements could be made to oral bioavailability in this series by reduction of the pK(a) of the basic nitrogen, by adding a fluorine atom to the piperidine ring, leading to 3-(4-fluoropiperidin-3-yl)-2-phenyl-1H-indole (17). Metabolic studies with this compound identified oxidation at the 6-position of the indole as a major route in vitro and in vivo in rats. Blocking this position with a fluorine atom led to 6-fluoro-3-(4-fluoropiperidin-3-yl)-2-phenyl-1H-indole (22), an antagonist with 0.06 nM affinity for h5-HT(2A) receptors, with bioavailability of 80% and half-life of 12 h in rats.

journal_name

J Med Chem

authors

Rowley M,Hallett DJ,Goodacre S,Moyes C,Crawforth J,Sparey TJ,Patel S,Marwood R,Patel S,Thomas S,Hitzel L,O'Connor D,Szeto N,Castro JL,Hutson PH,MacLeod AM

doi

10.1021/jm0004998

keywords:

subject

Has Abstract

pub_date

2001-05-10 00:00:00

pages

1603-14

issue

10

eissn

0022-2623

issn

1520-4804

pii

jm0004998

journal_volume

44

pub_type

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