Synthesis and Structure of Some 6,7-Dihydro-thiazolo[4,5- d ][1,3,2]diaza-λ 5 -phosphorines
摘要:
1,2,4-Thiadiazol-5(2H)-imines 1 react with malononitrile under ring cleavage cycloaddition and subsequent ring rearrangement. The products 2 incorporate the enaminonitrile fragment. Treatment of compounds 2 with phosphorus pentachloride results in thiazolo[4,5-d][1,3,2]diaza-lambda(5)-phosphorine derivatives 3 with a reactive chloro, substituent in position 2 and 4 which can be substituted by various nucleophiles. The structure of the trimethoxy derivative 7c was determined by an X-ray structure analysis.
2,3-Diaryl-5-anilino[1,2,4]thiadiazoles as melanocortin MC4 receptor agonists and their effects on feeding behavior in rats
作者:Kevin Pan、Malcolm K Scott、Daniel H.S Lee、Louis J Fitzpatrick、Jeffery J Crooke、Ralph A Rivero、Daniel I Rosenthal、Anil H Vaidya、Boyu Zhao、Allen B Reitz
DOI:10.1016/s0968-0896(02)00428-5
日期:2003.1
The melanocortin-4 receptor (MC4) modulates physiological functions such as feeding behavior, nerve regeneration, and drug addiction. Using a high throughput screen based on I-121-NDP-MSH binding to the human MC4 receptor, we discovered 2,3-diaryl-5-anilino[1,2,4]thiadiazoles 3 as potent and selective MC4 receptor agonists. Through SAR development on the three attached aryl rings, we improved the binding affinity from 174 nM to 4.4 nM IC50. When delivered intraperitoneally, compounds 3a, 3b, and 3c induced significant inhibition of food intake in a fasting-induced feeding model in rats. When delivered orally, these compounds lost activity, mainly due to rapid metabolism to inactive imidoylthiourea reduction products. (C) 2002 Elsevier Science Ltd. All rights reserved.
Goerdeler,J. et al., Chemische Berichte, 1979, vol. 112, p. 1288 - 1296
Synthesis and Biological Evaluation of a New Series of 2,3,5-Substituted [1,2,4]-Thiadiazoles as Modulators of Adenosine A<sub>1</sub> Receptors and Their Molecular Mechanism of Action
作者:Anikó Göblyös、Henk de Vries、Johannes Brussee、Adriaan P. IJzerman
DOI:10.1021/jm049337s
日期:2005.2.1
We synthesized two series (7a-i and 8a-i) of 2,3,5-substituted [1,2,4]-thiadiazole analogues of SCH-202676 (7a, 2,3-diphenyl-5-N-methylimino-2H-[1,2,4]-thiadiazole) with emphasis on the N-imino substituent. Compounds 7a-g,i and 8a-g at a final concentration of 1 muM significantly inhibited [H-3]CCPA (2-chloro-N-6-cyclopentyladenosine) agonist binding to human A, adenosine receptors. At the same concentration, all compounds appeared to increase [3H]DPCPX (1,3-dipropyl-8-cyclopentylxanthine) antagonist binding. Compound 7a and LUF5855 (7g) were selected for further characterization and studied in both equilibrium and kinetic radioligand binding experiments. The results suggest a nonstoichiometric interaction with the receptor. Further bioanalytical procedures (HPLC and MS) provided proof for an unusual receptor interaction in which 7a and 7g upon incubation were transformed into their corresponding thioureas 5a and 5g. We suggest that the thiadiazoles are sulfhydryl modifying agents rather than allosteric modulators, as they appear to reversibly modify the sulfhydryl groups of cysteine residues in cell membrane preparations.
GOERDELER J.; HAAG J.; LOEBACH W., CHEM. BER., 1979, 112, NO 4, 1288-1296