Design and synthesis of 6-fluoro-2-naphthyl derivatives as novel CCR3 antagonists with reduced CYP2D6 inhibition
摘要:
In our previous study on discovering novel types of CCR3 antagonists, we found a fluoronaphthalene derivative (1) that exhibited potent CCR3 inhibitory activity with an IC(50) value of 20 nM. However, compound 1 also inhibited human cytochrome P450 2D6 (CYP2D6) with an IC(50) value of 400 nM. In order to reduce its CYP2D6 inhibitory activity, we performed further systematic structural modi. cations on 1. In particular, we focused on reducing the number of lipophilic moieties in the biphenyl part of 1, using Clog D(7.4) values as the reference index of lipophilicity. This research led to the identification of N-{(3-exo)-8-[(6-fluoro-2-naphthyl)methyl]-8-azabicyclo[3.2.1]oct-3-yl}-3-(piperidin-1-ylcarbonyl)isonicotinamide 1-oxide (30) which showed comparable CCR3 inhibitory activity (IC(50) = 23 nM) with much reduced CYP2D6 inhibitory activity (IC50 = 29,000 nM) compared with 1. (C) 2008 Elsevier Ltd. All rights reserved.
In our previous study on discovering novel types of CCR3 antagonists, we found a fluoronaphthalene derivative (1) that exhibited potent CCR3 inhibitory activity with an IC(50) value of 20 nM. However, compound 1 also inhibited human cytochrome P450 2D6 (CYP2D6) with an IC(50) value of 400 nM. In order to reduce its CYP2D6 inhibitory activity, we performed further systematic structural modi. cations on 1. In particular, we focused on reducing the number of lipophilic moieties in the biphenyl part of 1, using Clog D(7.4) values as the reference index of lipophilicity. This research led to the identification of N-(3-exo)-8-[(6-fluoro-2-naphthyl)methyl]-8-azabicyclo[3.2.1]oct-3-yl}-3-(piperidin-1-ylcarbonyl)isonicotinamide 1-oxide (30) which showed comparable CCR3 inhibitory activity (IC(50) = 23 nM) with much reduced CYP2D6 inhibitory activity (IC50 = 29,000 nM) compared with 1. (C) 2008 Elsevier Ltd. All rights reserved.
Use of Sonication for the Coupling of Sterically Hindered Substrates in the Phenolic Mitsunobu Reaction
作者:Salvatore D. Lepore、Yuanjun He
DOI:10.1021/jo0345751
日期:2003.10.1
A vast rate increase in the Mitsunobu reaction of phenols with alcohols where either or both are stericallyhindered has been achieved by the use of high concentration combined with sonication.