4 documents found, page 1 of 1
Maytenus salicifolia Reissek (Celastraceae) : evaluation of the activity of ext...
Magalhães, Cássia Gonçalves; Silva, Grácia Divina de Fátima; Duarte, Lucienir Pains; Takahashi, Jacqueline Aparecida; Santos, Vagner RodriguesMaytenus salicifolia Reissek é conhecida como "cafezinho" em Minas Gerais, Brasil. Suas folhas são utilizadas na medicina popular no tratamento de úlceras estomacais. Neste trabalho é reportado o isolamento de 4´-Ometilepigalocatequina (1) e proantocianidina A (2) dos extratos polares da raiz (1; 4,36%; 2, 2,17%) e tronco (1, 4,16%; 2, 0,26%) de M. salicifolia. Pela primeira vez, esses compostos foram encontrad...
Rapid and efficient synthesis of α(1 – 2) mannobiosides.
Reina, José Juan; Maio, Antonio Di; Ramos Soriano, Javier; Figueiredo, Rute Cunha; Rojo Marcos, Francisco Javierα(1,2) mannobiosides with different substituents at the reducing end have been synthesized by a common strategy using benzoyls as the permanent protecting groups and an acetyl as the orthogonal protecting group at position C2 of the glycosyl acceptor. The new synthetic strategy has been performed remarkably reducing the number of purification steps, the time of synthesis (less than 72 hours) and improving the o...
Síntese de amidas e sulfonamidas de d-galactopiranosilamina e lactosilamina e a...
Butera, Anna Paola; Souza Filho, José Dias de; Carvalho, Diogo Teixeira; Figueiredo, Rute Cunha; Faria, Luiz Carlos Alves deWe report herein the synthesis of some -D-galactopyranosylamine and -lactosylamine amides and sulfonamides. The interactions of these compounds with lectins from the seeds of Erythrina cristagalli (LEC) and Ricinus communis (RCA120) were evaluated in a hemagglutination inhibitory activity assay. D-Galactose and lactose were used as reference compounds. The -lactosylamine amides and sulfonamides were nearly a...
Síntese de b-D-galactopiranosídeos de arila diméricos para avaliação de sua int...
Figueiredo, Rute Cunha; Meyer, Nádia Burkowski; Prado, Maria Auxiliadora Fontes; Rojo Marcos, Francisco JavierThe synthesis of two new D-galactose-based dimers having a 1,4-butanediamine spacer is reported aiming at the evaluation of their interaction with the Erythrina cristagalli lectin. The title compounds were prepared in four and five steps from 2,3,4,6-tetra-O-acetyl-b-D-galactopyranoside bromide, in 20 % and 15 % overall yield, respectively, using the Doebner modification of the Koenavenagel reaction as the key ...