The design, synthesis and biological activities of potent pyrazole-based tricyclic CB1 receptor antagonists (2) are described. The key synthetic step involves the ring closure of the lithiated alpha,gamma-keto ester adduct (4). The optimal nitroderivative (28) in this series exhibits a high CB1 receptor affinity (pK(i)=7.2) as well as very potent antagonistic activity (pA(2)=8.8) in vitro. The regioselectivity of the pyrazole ring closure is shown to depend strongly on the aromatic substitution pattern of the applied arylhydrazine.
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Lin, Yinchiu
Shia, Kak-Shan
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Shia, Kak-Shan
Hsiao, Wen-Chi
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Hsiao, Wen-Chi
Hsieh, Wan-Ping
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Hsieh, Wan-Ping
Yeh, Teng-Kuang
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Yeh, Teng-Kuang
Tseng, Shi-Liang
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Tseng, Shi-Liang
Hsu, Chia-Yu
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Hsu, Chia-Yu
Chao, Yu-Sheng
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan
Chao, Yu-Sheng
Hung, Ming-Shiu
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Natl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, TaiwanNatl Hlth Res Inst, Div Biotechnol & Pharmaceut Res, Zhunan Town 350, Miaoli County, Taiwan