一些新型的4-苯乙烯基四唑并[1,5- a ]喹喔啉和1-取代的4-苯乙烯基[1,2,4]三唑并[4,3- a ]喹喔啉衍生物的合成
摘要:
通过2-氯-3-甲基喹喔啉(2)的叠氮化物环缩合制备4-甲基四唑并[1,5- a ]喹喔啉(3)。3 与芳族醛的反应提供了4-苯乙烯基四唑并[1,5- a ]喹喔啉(4a – f)。用水合肼处理化合物2,得到2-肼基-3-甲基喹喔啉(5)。5的闭环是通过原酸酯与三氟乙酸反应生成4-甲基-1-(取代)[1,2,4]三唑并[4,3- a ]喹喔啉(7a – c)来实现的。进一步,反应具有不同芳族醛的7a – c提供了高收率的标题化合物4-styryl-1-(取代)[1,2,4]三唑并[4,3- a ]喹喔啉(8a – i)。在另一个方案中,肼化合物5用不同的芳族醛处理,得到相应的N-亚芳基肼基喹喔啉(6a – d)。此外,通过硝基苯的氧化环化反应生成1-芳基-4-甲基[1,2,4]三唑并[4,3- a ]喹喔啉(7d – g),与芳族醛缩合后得到标题化合物, 1-芳基-4-苯乙烯基[1,2,4]三唑[4
一些新型的4-苯乙烯基四唑并[1,5- a ]喹喔啉和1-取代的4-苯乙烯基[1,2,4]三唑并[4,3- a ]喹喔啉衍生物的合成
摘要:
通过2-氯-3-甲基喹喔啉(2)的叠氮化物环缩合制备4-甲基四唑并[1,5- a ]喹喔啉(3)。3 与芳族醛的反应提供了4-苯乙烯基四唑并[1,5- a ]喹喔啉(4a – f)。用水合肼处理化合物2,得到2-肼基-3-甲基喹喔啉(5)。5的闭环是通过原酸酯与三氟乙酸反应生成4-甲基-1-(取代)[1,2,4]三唑并[4,3- a ]喹喔啉(7a – c)来实现的。进一步,反应具有不同芳族醛的7a – c提供了高收率的标题化合物4-styryl-1-(取代)[1,2,4]三唑并[4,3- a ]喹喔啉(8a – i)。在另一个方案中,肼化合物5用不同的芳族醛处理,得到相应的N-亚芳基肼基喹喔啉(6a – d)。此外,通过硝基苯的氧化环化反应生成1-芳基-4-甲基[1,2,4]三唑并[4,3- a ]喹喔啉(7d – g),与芳族醛缩合后得到标题化合物, 1-芳基-4-苯乙烯基[1,2,4]三唑[4
Positive allosteric modulators of the metabotropic glutamate receptor subtype 4 (mGluR4). Part II: Challenges in hit-to-lead
作者:Richard Williams、Colleen M. Niswender、Qingwei Luo、Uyen Le、P. Jeffrey Conn、Craig W. Lindsley
DOI:10.1016/j.bmcl.2008.11.104
日期:2009.2
This Letter describes the synthesis and SAR of two mGluR4 positive allosteric modulator leads, 6 and 7. VU001171 (6) represents the most potent (EC50 = 650 nM), efficacious (141% Glu Max) and largest fold shift (36-fold) of any mGluR4 PAM reported to date. However, this work highlights the challenges in hit-to-lead for mGluR4 PAMs, with multiple confirmed HTS hits displaying little or no tractable SAR. (C) 2008 Elsevier Ltd. All rights reserved.
Copper(II) chloride mediated synthesis and DNA photocleavage activity of 1-aryl/heteroaryl-4-substituted-1,2,4-triazolo[4,3-a]quinoxalines
A new class of photonucleases, 1-aryl/heteroaryl-4-substituted-1,2,4-triazolo[4,3-a]quinoxalines (4) was synthesized in a facile and efficient manner via copper(II) chloride mediated oxidative intramolecular cyclization of 2-(arylidenehydrazino)-3-substituted-quinoxalines (3). DNA cleavage potency of compounds 4a-d (40 mu g each) was quantitatively evaluated on supercoiled plasmid Phi X174 under UV irradiation (312 nm, 15 W) without any additive. Compound 4c was found to be the most efficient DNA photocleaver which had converted supercoiled DNA (form I) into the relaxed DNA (form II) at 30 jig and the DNA photocleavage activity increases with increase in concentration of 4c. (C) 2011 Elsevier Masson SAS. All rights reserved.