Synthesis and structure–activity relationship of 3β-(4-alkylthio, -methylsulfinyl, and -methylsulfonylphenyl)tropane and 3β-(4-alkylthiophenyl)nortropane derivatives for monoamine transporters
摘要:
Early studies led to the identification of 3 beta-(4-methoxyphenyl)tropane-2 beta-carboxylic acid methyl ester (5) with high affinity at the DAT (IC(50) = 6.5 nM) and 5-HTT (K(i) = 4.3 nM), while having much less affinity at the NET (K(i) = 1110 nM). In the present study, we replaced the 4'-methoxy group of the 3 beta-phenyl ring with a bioisosteric 4'-methylthio group to give 7a. We also synthesized a number of 3 beta-(4-alkylthiophenyl)tropanes 7b-e, 3 beta-(4-methylsulfinylphenyl) and 3 beta-(4-methylsulfonylphenyl)tropane analogues 7f-h as well as the 3 beta-(4-alkylthiophenyl)nortropane derivatives 8-11 to further characterize the structure-activity relationship of this type of compound for binding at monoamine transporters. With exception of the 4'-methylsulfonyl analogue 7h, all the tested compounds possessed high binding affinities at the 5-HTT. The K(i) values ranged from 0.19 nM to 49 nM. The 3 beta-(4-methylthiophenyl)tropane 7a and its N-(3-fluoropropyl) analogue 9a and N- allyl analogue 10a are the most selective compounds for the 5-HTT over the NET (NET/5-HTT = 314-364) in the series. However, none of the compounds showed selectivity similar to 5 for both the DAT and 5-HTT relative to the NET. This study provided useful SAR information for rational design of potent and selective monoamine transporter inhibitors. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis and structure–activity relationship of 3β-(4-alkylthio, -methylsulfinyl, and -methylsulfonylphenyl)tropane and 3β-(4-alkylthiophenyl)nortropane derivatives for monoamine transporters
摘要:
Early studies led to the identification of 3 beta-(4-methoxyphenyl)tropane-2 beta-carboxylic acid methyl ester (5) with high affinity at the DAT (IC(50) = 6.5 nM) and 5-HTT (K(i) = 4.3 nM), while having much less affinity at the NET (K(i) = 1110 nM). In the present study, we replaced the 4'-methoxy group of the 3 beta-phenyl ring with a bioisosteric 4'-methylthio group to give 7a. We also synthesized a number of 3 beta-(4-alkylthiophenyl)tropanes 7b-e, 3 beta-(4-methylsulfinylphenyl) and 3 beta-(4-methylsulfonylphenyl)tropane analogues 7f-h as well as the 3 beta-(4-alkylthiophenyl)nortropane derivatives 8-11 to further characterize the structure-activity relationship of this type of compound for binding at monoamine transporters. With exception of the 4'-methylsulfonyl analogue 7h, all the tested compounds possessed high binding affinities at the 5-HTT. The K(i) values ranged from 0.19 nM to 49 nM. The 3 beta-(4-methylthiophenyl)tropane 7a and its N-(3-fluoropropyl) analogue 9a and N- allyl analogue 10a are the most selective compounds for the 5-HTT over the NET (NET/5-HTT = 314-364) in the series. However, none of the compounds showed selectivity similar to 5 for both the DAT and 5-HTT relative to the NET. This study provided useful SAR information for rational design of potent and selective monoamine transporter inhibitors. (C) 2009 Elsevier Ltd. All rights reserved.