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.
Lewis Acid Catalyzed Stereoselective Dearomative Coupling of Indolylboron Ate Complexes with Donor-Acceptor Cyclopropanes and Alkyl Halides
作者:Saikat Das、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.201711923
日期:2018.4.3
readily generated from 2‐lithioindoles and boronicesters underwent multicomponent dearomative coupling with D‐A cyclopropanes and alkyl halides in the presence of Sc(OTf)3 as a catalyst. The reactions proceeded with complete diastereoselectivity and excellent stereospecificity to provide indolines containing three contiguous stereocenters. The valuable boronicester moiety remains in the product and allows
A New Synthetic Route to Electrophilic Cyclopropane Derivatives from Olefins
作者:Nariyoshi Kawabata、Shinji Yano、Jiro Hashimoto、Jun-ichi Yoshida
DOI:10.1246/bcsj.54.2539
日期:1981.8
1-Bis(alkoxycarbonyl)-, 1-alkoxycarbonyl-1-cyano-, and 1,1-dicyanocyclopropane derivatives were obtained in 10–99% yields by the reaction of Br2C(COOR)2, Br2C(CN)(COOR), and KBr[Br2C(CN)2]4, respectively, with olefins and Cu2Br2 in dimethyl sulfoxide (DMSO).
Yb(OTf)<sub>3</sub> catalyzed [3 + 2] annulations of D–A cyclopropanes with β-oxodithioesters: a regioselective synthesis of tetrahydrothiophenes
作者:Shu-Wen Wang、Wei-Si Guo、Li-Rong Wen、Ming Li
DOI:10.1039/c5ra06355h
日期:——
An efficient approach to synthesis tetrahydrothiophenes was developed through the reaction of β-oxodithioesters and D–A cyclopropanes catalyzed by Yb(OTf)3. This methodology was highly regioselective.