18 F-Labeled indole-based analogs as highly selective radioligands for imaging sigma-2 receptors in the brain
摘要:
We have designed and synthesized a series of indole-based sigma(2) receptor ligands containing 5,6-dimethoxyisoindoline or 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline as pharmacophore. In vitro competition binding assays showed that all ten ligands possessed low nanomolar affinity (K-i=1.79-5.23 nM) for sigma(2) receptors and high subtype selectivity (K-1(sigma(2))/K-1 (sigma(1)) = 56-708). Moreover, they showed high selectivity for sigma(2) receptor over the vesicular acetylcholine transporter (>1000-fold). The corresponding radiotracers [F-18]16 and [F-18]21 were prepared by an efficient one-pot, two-step reaction sequence with a home-made automated synthesis module, with 10-15% radiochemical yield and radiochemical purity of >99%. Both radiotracers showed high brain uptake and o-2 receptor binding specificity in mice. (C) 2017 Elsevier Ltd. All rights reserved.
18 F-Labeled indole-based analogs as highly selective radioligands for imaging sigma-2 receptors in the brain
摘要:
We have designed and synthesized a series of indole-based sigma(2) receptor ligands containing 5,6-dimethoxyisoindoline or 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline as pharmacophore. In vitro competition binding assays showed that all ten ligands possessed low nanomolar affinity (K-i=1.79-5.23 nM) for sigma(2) receptors and high subtype selectivity (K-1(sigma(2))/K-1 (sigma(1)) = 56-708). Moreover, they showed high selectivity for sigma(2) receptor over the vesicular acetylcholine transporter (>1000-fold). The corresponding radiotracers [F-18]16 and [F-18]21 were prepared by an efficient one-pot, two-step reaction sequence with a home-made automated synthesis module, with 10-15% radiochemical yield and radiochemical purity of >99%. Both radiotracers showed high brain uptake and o-2 receptor binding specificity in mice. (C) 2017 Elsevier Ltd. All rights reserved.
Synthesis and characterization of selective dopamine D2 receptor antagonists. 2. Azaindole, benzofuran, and benzothiophene analogs of L-741,626
作者:Suwanna Vangveravong、Michelle Taylor、Jinbin Xu、Jinquan Cui、Wesley Calvin、Sonja Babic、Robert R. Luedtke、Robert H. Mach
DOI:10.1016/j.bmc.2010.05.052
日期:2010.7
A series of indole, 7-azaindole, benzofuran, and benzothiophene compounds have been prepared and evaluated for affinity at D2-like dopamine receptors. These compounds share structural elements with the classical D2-like dopamine receptor antagonists haloperidol, N-methylspiperone and benperidol. Two new compounds, 4-(4-iodophenyl)-1-((4-methoxy-1H-indol-3-yl) methyl) piperidin-4-ol (6) and 4-(4-iodophenyl)-1-((5-methoxy-1H-indol-3-yl) methyl) piperidin-4-ol (7), were found to have high affinity to and selectivity for D2 versus D3 receptors. Changing the aromatic ring system from an indole to other heteroaromatic ring systems reduced the D2 binding affinity and the D2 versus D3 selectivity. (C) 2010 Elsevier Ltd. All rights reserved.
18 F-Labeled indole-based analogs as highly selective radioligands for imaging sigma-2 receptors in the brain
We have designed and synthesized a series of indole-based sigma(2) receptor ligands containing 5,6-dimethoxyisoindoline or 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline as pharmacophore. In vitro competition binding assays showed that all ten ligands possessed low nanomolar affinity (K-i=1.79-5.23 nM) for sigma(2) receptors and high subtype selectivity (K-1(sigma(2))/K-1 (sigma(1)) = 56-708). Moreover, they showed high selectivity for sigma(2) receptor over the vesicular acetylcholine transporter (>1000-fold). The corresponding radiotracers [F-18]16 and [F-18]21 were prepared by an efficient one-pot, two-step reaction sequence with a home-made automated synthesis module, with 10-15% radiochemical yield and radiochemical purity of >99%. Both radiotracers showed high brain uptake and o-2 receptor binding specificity in mice. (C) 2017 Elsevier Ltd. All rights reserved.