Synthesis and anticonvulsant activity of new 6-methyl-1-substituted-4,6-diazaspiro[2.4]heptane-5,7-diones
摘要:
In the present study on the development of new anticonvulsants, twenty new 6-methyl-1-substituted-4,6-diazaspiro[2.4]heptane-5,7-diones were synthesized and tested for anticonvulsant activity using the maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) screens. Their neurotoxicity was determined by the rotorod test. In this series, all of the alkyl- and aryl-substituted 5,5-cyclo-propanespirohydantoins showed more or less protection against MES and/or scPTZ models. The most active of the series was 6-methyl-1-(4-(methylsulfonyl)phenyl)-4,6-diazaspiro[2.4]heptane-5,7-dione (6t), which showed a MES ED50 value of 12.5 mg/kg in mice. The median toxic dose (TD50) was 310 mg/kg, providing compound 6t with a protection index (PI = TD50/ED50) of 24.8 in the MES test which is better than phenytoin. (C) 2010 Elsevier Masson SAS. All rights reserved.
Single electron transfer induced elemental steps in the transformation of iodomalonic esters and related CH-acids under solid-liquid PTC conditions. Preparation of electrophilic cyclopropanes
作者:László Tőke、Zoltán Hell、Gábor T. Szabó、Gábor Tóth、Mária Bihari、Antal Rockenbauer
DOI:10.1016/s0040-4020(01)81878-0
日期:1993.6.4
Single electron transfer induced elemental steps have been shown to occur during the transformation of iodomalonic esters and related CH-acids to cyclopropane derivatives undersolid-liquid phase transfer catalytic conditions. The iodo derivatives are formed from iodine and CH-acids “in situ”, in the same pot in which the transformations to cyclopropane derivatives take place. A number of electrophilic
Latent inhibitors. Part 7. Inhibition of dihydro-orotate dehydrogenase by spirocyclopropanobarbiturates
作者:William Fraser、Colin J. Suckling、Hamish C. S. Wood
DOI:10.1039/p19900003137
日期:——
synthesized. Dihydro-orotate dehydrogenase from Clostridium oroticum was shown to be inhibited by these compounds. A related series of 5-membered-ring compounds (hydantoins and pyrazoles) was prepared but all the compounds were found to be inactive. In order to correlate these observations with previous results concerning 5-arylmethylhydantoins and 5-arylidene-hydantoins as inhibitors, 5-arylidenebarbiturates
Reaction of non-activated olefins with CH-acids; a novel method for the preparation of electrophilic cyclopropanes
作者:László Tóke、Gábor T Szabó、Zoltán Hell、Gábor Tóth
DOI:10.1016/s0040-4039(00)88529-9
日期:1990.1
Reaction of non-activated olefines with active methylene compounds was accomplished under solid-liquid phase-transfer conditions, in the presence of iodine, to give electrophiliccyclopropanes of a wide range of substituents. Several data to the mechanism of the reaction are also given.
Oxidative addition of 1,3-dicarbonyl compounds to olefins by the action of the Mn(OAc)3/LiCl system and the synthesis of functionally substituted cyclopropanes
作者:M. G. Vinogradov、V. I. Dolinko、G. I. Nikishin
DOI:10.1007/bf00951066
日期:1984.2
Electrosynthesis of cyclopropane derivatives by a Perkin-type reaction
作者:V. A. Petrosyan、A. A. Vasil'ev、V. I. Tatarinova
DOI:10.1007/bf00699141
日期:1994.1
Electrolysis of active methylene compounds at a Pt cathode in MeCN in the presence of vicinal dihaloalkanes leads to cyclopropane derivatives in yields up to 90 %. In the cases of CH-acids with low pK(a) it is expedient to apply more active dihaloalkanes, while for CH-acids with higher pK(a) the desired product yields may be raised using electrogenerated bases.