Synthesis and Evaluation of 18F-Labeled Styryltriazole and Resveratrol Derivatives for β-Amyloid Plaque Imaging
摘要:
In the present study, a styryltriazole and four resveratrol derivatives were synthesized as candidates for beta-amyloid (A beta) plaque imaging. On the basis of their binding affinities to A beta(1-42) aggregates, the styryltriazole (1, K-i = 12.8 nM) and one resveratrol derivative (5, K-i = 0.49 nM) were labeled with F-18. In normal mice, tissue distribution of [F-18]5 showed good initial brain uptake (3.26% ID/g at 2 min) but slow wash-out from brains (2-to-60 min uptake ratio: 2.9). Furthermore, it underwent in vivo metabolic defluorination (1.88% ID/g at 2 min and 9.73% ID/g at 60 min). In contrast, [F-18]1 displayed high initial brain uptake (5.38% ID/g at 2 min) with rapid wash-out from brains (0.52% ID/g at 60 min; 2-to-60 min uptake ratio: 10.3). These results indicate that [F-18]1 has in vivo kinetics comparable to PET radiopharmaceuticals currently under commercial development, demonstrating that [F-18]1 is a desirable PET radioligand for A beta plaque imaging.
Copper(II) SBA-15: A reusable catalyst for azide–alkyne cycloaddition
摘要:
The azide-alkyne cycloaddition reaction was investigated under catalytic conditions involving a copper(II) loaded silica based mesoporous material. Cu(II) SBA-15 demonstrated a high catalytic effect in 1,4-triazoles synthesis in organic. No additives such as a base or a reductant are required. Quantitative yields were obtained and a mere filtration of the mesoporous material which retains copper(II) allows the recovery of the catalyst. In addition, up to 5 times recycling of the catalyst was achieved without loss of the activity affording 1,4-triazoles in a yield up to 98%. (C) 2014 Elsevier B.V. All rights reserved.
The azide-alkyne cycloaddition reaction was investigated under catalytic conditions involving a copper(II) loaded silica based mesoporous material. Cu(II) SBA-15 demonstrated a high catalytic effect in 1,4-triazoles synthesis in organic. No additives such as a base or a reductant are required. Quantitative yields were obtained and a mere filtration of the mesoporous material which retains copper(II) allows the recovery of the catalyst. In addition, up to 5 times recycling of the catalyst was achieved without loss of the activity affording 1,4-triazoles in a yield up to 98%. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis and Evaluation of <sup>18</sup>F-Labeled Styryltriazole and Resveratrol Derivatives for β-Amyloid Plaque Imaging
作者:Iljung Lee、Yearn Seong Choe、Joon Young Choi、Kyung-Han Lee、Byung-Tae Kim
DOI:10.1021/jm201400q
日期:2012.1.26
In the present study, a styryltriazole and four resveratrol derivatives were synthesized as candidates for beta-amyloid (A beta) plaque imaging. On the basis of their binding affinities to A beta(1-42) aggregates, the styryltriazole (1, K-i = 12.8 nM) and one resveratrol derivative (5, K-i = 0.49 nM) were labeled with F-18. In normal mice, tissue distribution of [F-18]5 showed good initial brain uptake (3.26% ID/g at 2 min) but slow wash-out from brains (2-to-60 min uptake ratio: 2.9). Furthermore, it underwent in vivo metabolic defluorination (1.88% ID/g at 2 min and 9.73% ID/g at 60 min). In contrast, [F-18]1 displayed high initial brain uptake (5.38% ID/g at 2 min) with rapid wash-out from brains (0.52% ID/g at 60 min; 2-to-60 min uptake ratio: 10.3). These results indicate that [F-18]1 has in vivo kinetics comparable to PET radiopharmaceuticals currently under commercial development, demonstrating that [F-18]1 is a desirable PET radioligand for A beta plaque imaging.