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简介：Ｔｈｅｓｙｎｔｈｅｓｉｓｏｆｐｏｒｐｈｙｒｉｎｎｉｔｒｏｇｅｎｍｕｓｔａｒｄｓｆｒｏｍｄｅｕｔｅｒｏｐｏｒｐｈｙｒｉｎａｎｄ３，８ｄｉａｌｋｙｌｏｘｙｈｅｍａｔｏｐｏｒｐｈｙｒｉｎｍｅｔｈｙｌｅｓｔｅｒｓｔｈｒｏｕｇｈｒｅｄｕｃｔｉｏｎ，ｂｒｏ...

简介：3α-bromo-epipicropodophyllinwaspreparedanditsinhibitionactivitiesagainstKBcellsandL1210leukemiacellsinvitroarehigherthanthoseofVP-16,awidelyuseddruginclinicatpresent.ThisisthefirsttimetointroducesubstitutionatC-3ofring-Cintheworkofmodifyingstructureofpodophyllotoxin.Itcanbetransformedeasilyto4β-hydroxy-2,3-ene-apopicropodophyllinunderbasiccondition,sothat,correspondingderivativesof2,3-ene-apopicropodophyllinwithsubstitutiononcarbon-4couldbesynthesized.Thiscompoundcanberegardednotonlyasaleadingcompoundtobemodifiedbecauseofitsantitumoractivities,butalsoasanintermediateforthestructuretransformation.

简介：AIMThepreviousworkhasdemonstratedthatthepolysaccharidesofAngelicasinensis(Oliv.)Dielshavesignificantlyantitumoractivityandindicatedthattheactivityisstronglydependentontheirstructures.However,therelationshipsbetweenthestructureandtheactivitiesarestillambiguous.Thus,atpresent,moreeffortsarebeingexpendedinseekingtoisolatethepolysaccharidesfromAngelicasinensis(Oliv.)Diels,measuretheirstructuralfeaturesandantitumoractivities,andelucidatestructure-activityrelationshipsofpolysaccharides.METHODSTherootsofAngelicasinensis(Oliv.)DielswereextractedWithwater,separatedbySephacrylS-400andDEAE-sephadexA-25columnsandfurtherpurifledonSephadexG-100column.

简介：以对羟基苯甲酸乙酯为原料，经肼解、环化合成５（４羟基苯基）１，３，４二唑２硫酮，继而经Ｍａｎｎｉｃｈ反应合成了四种新曼尼希碱，其结构经红外光谱、核磁共振和元素分析证实。初步抑菌活性试验表明，显示弱的抑菌活性。

简介：Lactivicin,anovelinhibitorofbacterialcellwallsynthesis,wasisolatedfromtheculturefil-tratesofmicroorganismYK-258andYK-422.Itexhibitsbiologicalactivitiessimilartothoseoftheβ-lactamantibiotics,althoughitdoesnothaveaβ-lactamringinitsmolecule.Sincethediscoveryoflactivicin,hundredsofitsderivativeshavebeensynthesized.Most