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1.
An. acad. bras. ciênc ; 62(4): 329-33, dez. 1990. ilus
Article in English | LILACS | ID: lil-94998

ABSTRACT

The reactions of isomeric dilydronaphthofuran-quinones of the alfa ß type, 1 and 5, respectively, with NBS, under visible light, gave products. These reactions represent a new route to structural types represented by naphthol [1,2-b] furan and naphtho [2,3-b] furan quinones and lead to a new assessment of biosynthetic theory concerning the furan ring in plants


Subject(s)
Bromine/metabolism , Furans , Naphthoquinones , Chromatography, Gel
2.
An. acad. bras. ciênc ; 62(3): 217-24, set. 1990. tab
Article in Portuguese | LILACS | ID: lil-92524

ABSTRACT

Several synthetic, semi-synthetic and natural compounds as well extracts were screened for their growht inhibition activity on KB cells. The most active ones were naphthoquinones and derivatives of pyrido [4,3-b] carbazole alkaloids, with inhibition dose (ID50) < 4microng/ml. Of the crude extracts of several plants screened, Vellozia caput-ardeae showed to be the most active


Subject(s)
Antineoplastic Agents, Phytogenic/isolation & purification , KB Cells , Antineoplastic Agents, Phytogenic/chemistry , Antineoplastic Agents, Phytogenic/pharmacology , Drug Screening Assays, Antitumor
3.
Rev. microbiol ; 19(3): 338-42, jul.-set. 1988. tab
Article in Portuguese | LILACS | ID: lil-69502

ABSTRACT

Foram estudadas 15 substâncias de estrutura naftoquinônica obtidas de síntese química: a própria 1,4-naftoquinona sem substituintes, um derivado com um radical hidroxila na posiçäo 2 e 13 derivados hidroxilados apresentando diferentes grupos metileno-amino na posiçäo 3. As culturas de células foram protegidas com as drogas antes da titulaçäo dos vírus (pólio 1, Coxackie B4 e ECHO 19). Pela determinaçäo do índice de inibiçäo virótico (IIV) mostrou-se que o ECHO-vírus 19 foi o mais inibido. Dos 14 compostos testados, 3 deles mostraram um IIV significativo contrao ECHO-vírus como segue: IIV de 1,75 para 2-HO-1,4-naftoquinina e 2-HO-3 (N-morfolil)-metil-1, 4-naftoquinona e IIV de 3,75 para 2-HO-3-N-benzil-N'(N-benzil-2-etilamina) -1,4-naftoquinona. Este último composto mostrou atividade virucida, em experiência paralela, significando que a droga afeta diretamente a partícula viral


Subject(s)
Naphthoquinones/pharmacology , Enterovirus/drug effects , Chemistry
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