Mesoionic xanthine analogs: phosphodiesterase inhibitory and hypotensive activity
作者:Richard A. Glennon、Michael E. Rogers、J. Doyle Smith、M. K. El-Said、John L. Egle
DOI:10.1021/jm00138a002
日期:1981.6
Several mesoionic thiazolo[3,2-alphapyrimidines and mesoionic 1,3,4-thiadiazol[3,2-alpha-pyrimidines were evaluated as inhibitors of cyclic-AMPphosphodiesterase. While small alkyl substituents at the 6 position have no significant effect on activity, phenyl and benzyl substituents enhance activity. Mesoionic structures such as 1 (R2 = H; R8 = Et) possess 20 to 40 times the activity of theophylline
Synthesis and reactions of 4-Hydroxy-2(1<i>H</i>)-pyridones with thienyl and pyridyl substituents in position 6 starting with azomethines and malonates
作者:Barbara Schnell
DOI:10.1002/jhet.5570360234
日期:1999.3
The reaction of 4 with substituted diethyl malonates 5a, or “magic malonates” (bis-2,4,6-trichlorophenylmalonates 5b) leads to 4-hydroxy-2(1H)-pyridones 6. The azomethines 4 are prepared via the Strecker compounds 3 starting with methyl ketones 1, anilines, and potassium cyanide. Chlorination of pyridones 6 with sulfurylchloride leads to compounds 7 while nitration gives 9.
的反应4与取代的二乙基丙二酸酯5a中,或“魔术丙二酸酯”(双-2,4,6- trichlorophenylmalonates 5B)导致4-羟基-2(1 H ^) -吡啶酮6的甲亚胺4制备经由所述斯特雷克尔从甲基酮1,苯胺和氰化钾开始的化合物3。用硫酰氯氯化吡啶酮6会生成化合物7,而硝化则会生成9。
Mesoionic xanthine analogs: antagonists of adenosine receptors
作者:Richard A. Glennon、Shanaz M. Tejani-Butt、William Padgett、John W. Daly
DOI:10.1021/jm00376a027
日期:1984.10
A variety of mesoionic xanthines including mesoionic thiazolo[3,2-alpha]pyrimidines, benzothiazolopyrimidines, and 1,3,4-thiadiazolo[3,2-alpha]pyrimidines were antagonists of A1-adenosine receptors (inhibition of binding of [3H]-cyclohexyladenosine) and A2-adenosine receptors (inhibition of 2-chloroadenosine-elicited accumulations of cyclic AMP) in brain tissue. Most of the compounds were less potent than theophylline and none were remarkably selective for A1- or A2-adenosine receptors. However, members of the thiadiazolopyrimidine class of mesoionics exhibited very low or no activity as antagonists of A2-adenosine receptors while exhibiting activity only 2-4-fold lower than that of theophylline at A1-adenosine receptors. Unlike the case for theophylline, the presence of a phenyl substituent in the five-membered ring did not enhance the potency of a mesoionic thiadiazolopyrimidine. The nature of the substituents on the mesoionic ring did not appear to have marked effects on potency unlike the marked effect of the nature of 1,3-substituents on activity of nonmesoionic xanthines. The benzothiazolo[3,2-alpha]pyrimidines were the most potent antagonists, being nearly as potent as theophylline at A1-adenosine receptors and somewhat more potent than theophylline at A2-adenosine receptors.
Benz-fused mesoionic xanthine analogs as inhibitors of cyclic-AMP phosphodiesterase
作者:Richard A. Glennon、Judith J. Gaines、Michael E. Rogers
DOI:10.1021/jm00138a027
日期:1981.6
Mesoionische Sechsringheterocyclen, XVI Syntheses von 2 a, 5 a-Diaza-acenaphthylen Mesoionen