Structure-activity relationship and biochemical evaluation of novel fibroblast activation protein and prolyl endopeptidase inhibitors with α-ketoamide warheads
Nonprostanoid prostacyclin mimetics. 5. Structure-activity relationships associated with [3-[4-(4,5-diphenyl-2-oxazolyl)-5-oxazolyl]phenoxy]acetic acid
作者:Nicholas A. Meanwell、Jeffrey L. Romine、Michael J. Rosenfeld、Scott W. Martin、Ashok K. Trehan、J. J. Kim Wright、Mary F. Malley、Jack Z. Gougoutas、Catherine L. Brassard
DOI:10.1021/jm00076a018
日期:1993.11
cis-olefin moiety of 3 into various ring systems was examined. Incorporation of the cis-olefin of 3 into either an oxazole (26) or an unsubstituted pyrazole (35) heterocycle provided compounds that are equipotent with progenitor 3. However, the oxazole 11f, which is isomeric with 26, inhibits ADP-induced human platelet aggregation in vitro with an IC50 of 0.027 microM, 6-fold more potent than 3, 26, or
3-Phenyl-Substituted Imidazo[1,5-<i>a</i>]quinoxalin-4-ones and Imidazo[1,5-<i>a</i>]quinoxaline Ureas That Have High Affinity at the GABA<sub>A</sub>/Benzodiazepine Receptor Complex
作者:E. Jon Jacobsen、Lindsay S. Stelzer、Kenneth L. Belonga、Donald B. Carter、Wha Bin Im、Vimala H. Sethy、Andrew H. Tang、Philip F. VonVoigtlander、James D. Petke
DOI:10.1021/jm960070+
日期:1996.1.1
A series of imidazo[1,5-alpha]quinoxalin-4-ones and imidazo[1,5-alpha]quinoxaline ureas containing substituted phenyl groups at the 3-position was developed. Compounds within the imidazo-[1,5-alpha]quinoxaline urea series had high affinity for the GABA(A)/benzodiazepine receptor complex with varying in vitro efficacy, although most analogs were partial agonists as indicated by [S-35]TBPS and Cl- current ratios. Interestingly, a subseries of piperazine ureas was identified which had biphasic efficacy, becoming more antagonistic with increasing concentration. Analogs within the imidazo [1,5-alpha] quinoxalin-4-one series had substantially decreased binding affinity as compared to the quinoxaline urea series. These compounds ranged from antagonists to full agonists by in. vitro analysis, with several derivatives having roughly 4-fold greater intrinsic activity than diazepam as indicated by Cl- current measurement. Numerous compounds from both series were effective in antagonizing metrazole-induced seizures, consistent with anti-convulsant properties and possible anxiolytic activity. Most of the quinoxaline ureas and quinoxalin-4-ones were active in an acute electroshock physical dependence side effect assay in mice precluding further development.
Synthesis of Tetrazole-substituted Spirocyclic γ-lactams by One-pot Azido-Ugi Reaction–cyclization
作者:Vasiliy Yu. Stolyarenko、Anatoliy A. Evdokimov、Vladimir I. Shishkin
DOI:10.1016/j.mencom.2013.03.020
日期:2013.3
1-Ethoxycarbonyl-1-(2-oxoethyl)cycloalkanes in the azido-Ugi reaction with primary amines, isocyanides and TMS-N-3 afford 3-(tetrazol-5-yl)-2-azaspiro [4.n]alkan-1-ones.
One-Pot Synthesis of Imidazo[1,5-c]pyrimidine Derivatives from a 4,6-Dichloropyrimidine Derivative and Benzyl Isocyanides
A convenient method for the synthesis of imidazo[1,5-c]pyrimidine derivatives has been developed. Thus, benzyl isocyanides are treated with sodium hydride in DMF at 0 degrees C to generate the corresponding benzyl anions, which are allowed to react with 4,6-dichloro-2-(methylsulfanyl)pyrimidine (DCSMP) to afford 1-aryl-7-chloro-5-(methylsulfanypimidazo[1,5-c]pyrimidines in one pot in moderate yields.
Cyanide Abstractions from Benzyl Isocyanides by Phenyl and Tri-<i>n</i>-Butyltin Radicals: New Examples of S<sub>H</sub>2 Reactions