The synthesis of new diastereomers of (4S,8aS)- and (4R,8aS)-4-phenyl-perhydropyrrole[1,2-a]pyrazine-1,3-dione
摘要:
The synthesis of new (4S,8aS)- and (4R,8aS)-4-phenyl-perhydropyrrole[1,2-a]pyrazine-1,3-diones in the cyclocondensation reaction of the respective derivatives of L-prolineamide is described. The effect of the amount of NaOEt, temperature, and reaction time on the proportions of diastereomers formed in the cyclocondensation reaction was examined. The structures of the diastercomers were confirmed by GC/MS, FIRMS, HPLC; XRD, and H-1 and C-13 NMR investigations. (C) 2007 Elsevier Ltd. All rights reserved.
A number of novel pyrrole[1,2-a]pyrazinederivatives were synthesized and evaluated in in vivo animal models of epilepsy. Among them, several compounds displayed promising seizure protection in the maximal electroshock seizure (MES), subcutaneous metrazol seizure (scMET), 6 Hz and pilocarpine-induced status prevention (PISP) tests, with ED50 values comparable to the reference anticonvulsant drugs (AEDs)
合成了许多新颖的吡咯[1,2- a ]吡嗪衍生物,并在癫痫的体内动物模型中进行了评估。其中,几种化合物在最大电击惊厥(MES),皮下甲硝唑惊厥(scMET),6 Hz和毛果芸香碱引起的状态预防(PISP)测试中显示出有希望的癫痫保护作用,其ED 50值可与参考抗惊厥药(AEDs)相提并论。 )。观察到吡咯[1,2- a ]吡嗪核心的立体化学和构象偏好对体内药理活性的关键影响。合成药物的抗惊厥作用机制很可能不是通过抑制电压依赖性钠(Na+)电流。
A chemical method for the preparation of novel 1,5-benzodiazepines acting as CCK-B antagonists in high enantiomeric purity
A series of new N-(1,5-benzodiazepin-3-yl)-N′-arylureas, 2, bearing an alkyl substituent at the N5 position of the benzodiazepine nucleus has been studied as potential CCK-B antagonists. The homochiral compounds were obtained by resolving their precursors (amines 4) with a new resolution method based on the reaction between the amines and the chiralauxiliary5, the subsequent separation of the diastereomers
Synthesis and structure–activity relationship of new 1,5-dialkyl-1,5-benzodiazepines as cholecystokinin-2 receptor antagonists
作者:Karen Roberts、Antonella Ursini、Robert Barnaby、Paolo G. Cassarà、Mauro Corsi、Giovanni Curotto、Daniele Donati、Aldo Feriani、Gabriella Finizia、Carla Marchioro、Daniela Niccolai、Beatrice Oliosi、Stefano Polinelli、Emiliangelo Ratti、Angelo Reggiani、Giovanna Tedesco、Maria E. Tranquillini、David G. Trist、Franciscus T.M. van Amsterdam
DOI:10.1016/j.bmc.2011.05.057
日期:2011.7
This article deals with the synthesis and the activities of some 1,5-dialkyl-3-arylureido-1,5-benzodiazepin-2,4-diones which were prepared as potential CCK2 antagonists, with the intention to find a possible follow up of our lead compound GV150013, showing an improved pharmacokinetic profile. The phenyl ring at N-5 was replaced with more hydrophilic substituents, like alkyl groups bearing basic functions
A new series of chiral pyrido[1,2-a]pyrazinederivatives was synthesised and evaluated in in vivo animal models of epilepsy. A significant influence of the stereochemistry of the pyrido[1,2-a]pyrazine framework on the pharmacological activity was observed. Compounds with (4R,9aS) absolute configuration proved inactive, whereas other stereoisomers exhibited markedly dissimilar spectra of anti-seizure
合成了一系列新的手性吡啶并[1,2- a ]吡嗪衍生物,并在癫痫的体内动物模型中进行了评估。观察到吡啶并[1,2- a ]吡嗪骨架的立体化学对药理活性的重大影响。具有(4 R,9a S)绝对构型的化合物被证明是无活性的,而其他立体异构体在最大电击发作(MES),皮下Metrazol发作(scMET)和毛果芸香碱引起的状态预防(PISP)方面显示出明显不同的抗癫痫功效谱测试。重要的是,被研究的药物在ED 50的6 Hz模型中显示出很高的效价。值可与参考药物左乙拉西坦相当。衍生物(4 S,9a R)-6和(4 R,9a R)-6作为有前途的新先导结构出现,前者具有广泛的抗惊厥活性,而后者在6 Hz和PISP模型中显示出高效力。