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Journals and Conferences
Betulinic acid was sulfonated by sulfamic acid in the presence of urea in homogeneous 1,4-dioxane or DMF solution at 65–75°C in 2.5–3.5 h to give betulinic acid 3-sulfate, the structure of which was… (More)
Betulinic acid [3 -hydroxylup-20(29)-en-28-oic acid] is an especially interesting betulin derivative because it is a selective growth inhibitor of human malignant melanoma cells and possesses… (More)
Betulin was sulfated by sulfamic acid in the presence of urea in homogeneous solution in 1,4-dioxane or N,N-dimethylformamide (DMF). The reaction time for betulin sulfation in DMF at 60–70°C was… (More)
Betulin-3,28-dibenzoate and -3,28-diphthalate were synthesized for the first time by reacting betulin with melts of benzoic and phthalic acids at 190–200°C for 5 min.