Regioisomeric 3-, 4- and 5-aminomethyl isoxazoles: synthesis and muscarinic activity
摘要:
A series of 3-, 4- and 5-aminomethyl isoxazoles and isoxazoles with one or two additional methyl groups at the heterocycle were synthesized in order to investigate the structural requirements, ie heterocyclic moiety, regiochemistry and length of an aminoalkyl unit, for muscarinic activity. This was assayed on isolated rabbit vas deferens (M(1) receptor subtype) and isolated guinea-pig atrium (M(2) receptor subtype) and ileum (M(3) receptor subtype). The isoxazoles tested are one to three orders of magnitude less active than furane or oxadiazole derivatives, having similar structural characteristics except for the heterocycle. Thus, the differences in molecular point charges and charge distribution contribute to the muscarinic activity of these compounds more than small differences in molecular shape and conformational energies.
Antimicrobial, Antimalarial, and Antileishmanial Activities of Mono- and Bis-quaternary Pyridinium Compounds
作者:Sandip B. Bharate、Charles M. Thompson
DOI:10.1111/j.1747-0285.2010.01035.x
日期:2010.12
quaternary pyridinium oximes against a number of lower pathogenicity BSL‐1 and 2 agents. In general, our compound panel had little to no antimicrobial action except for thiophene‐ and benzothiophene‐substituted monoquaternary pyridinium compounds 21 and 24 that showed moderate antibacterial activity against Staphylococus aureus and methicillin‐resistant S. aureus with IC50 values ranging from 12.2
A series of 3-, 4- and 5-aminomethyl isoxazoles and isoxazoles with one or two additional methyl groups at the heterocycle were synthesized in order to investigate the structural requirements, ie heterocyclic moiety, regiochemistry and length of an aminoalkyl unit, for muscarinic activity. This was assayed on isolated rabbit vas deferens (M(1) receptor subtype) and isolated guinea-pig atrium (M(2) receptor subtype) and ileum (M(3) receptor subtype). The isoxazoles tested are one to three orders of magnitude less active than furane or oxadiazole derivatives, having similar structural characteristics except for the heterocycle. Thus, the differences in molecular point charges and charge distribution contribute to the muscarinic activity of these compounds more than small differences in molecular shape and conformational energies.
Bisquaternary pyridinium oximes: Comparison of in vitro reactivation potency of compounds bearing aliphatic linkers and heteroaromatic linkers for paraoxon-inhibited electric eel and recombinant human acetylcholinesterase
作者:Sandip B. Bharate、Lilu Guo、Tony E. Reeves、Douglas M. Cerasoli、Charles M. Thompson
DOI:10.1016/j.bmc.2009.11.052
日期:2010.1
bearing aliphatic linkers were synthesized and evaluated for their in vitroreactivation potency against paraoxon-inhibited electric eelacetylcholinesterase (EeAChE) and recombinant human acetylcholinesterase (rHuAChE). Results herein indicate that most of the compounds are better reactivators of EeAChE than of rHuAChE. The reactivation potency of two different classes of compounds with varying linker
肟再活化剂是 OP(有机磷)中毒后处理的首选药物,广泛用于 OP 抑制的胆碱酯酶的机械和动力学研究。本研究的目的是评估新的肟化合物重新激活被 OP 对氧磷抑制的乙酰胆碱酯酶 (AChE)。合成了几种新的带有杂环接头的双季吡啶肟以及一些已知的带有脂肪族接头的双季吡啶肟,并评估了它们对对氧磷抑制电鳗乙酰胆碱酯酶 (EeAChE) 和重组人乙酰胆碱酯酶 (rHuAChE) 的体外再激活效力。本文的结果表明,大多数化合物是 EeAChE 比 rHuAChE 更好的再活化剂。比较了具有不同接头链的两类不同化合物的再活化效力,并观察到连接链的结构是再活化剂活性的重要因素。在较高浓度(10-3 M),带有脂肪族接头的化合物比带有杂环接头的化合物表现出更好的再活化。有趣的是,具有杂环接头的肟在较高浓度(10 -3 M)下抑制AChE ,而在较低浓度(10 -4 M 和10 -5 M)下它们的再激活