2009
DOI: 10.1016/j.tetlet.2008.12.043
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Synthesis of betulinic acid acyl glucuronide for application in anticancer prodrug monotherapy

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Cited by 39 publications
(22 citation statements)
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“…Based on in vivo metabolisation studies realized by Wen et al (2006) with bevirimat, a structural analog of triterpene 3 also in phase II clinical trials for the treatment of HIV, we hypothesized that 28-O-b-D-glucuronide betulinic acid (139) should be a major metabolic product. Thus, we undertook the synthesis of the acyl glucuronide 139 (Gauthier et al 2009e). After many fruitless assays, the synthesis of glucuronide 139 was successfully achieved in good yield (76%) with high stereo-and regioselectivity by the condensation of betulinic acid (3) with the commercially available methyl 2,3,4-tri-O-acetyl-1-bromo-a-D-glucopyranuronate (140) under modified phase-transfer conditions (Fig.…”
Section: Betulinic Acid Glucuronidementioning
confidence: 99%
“…Based on in vivo metabolisation studies realized by Wen et al (2006) with bevirimat, a structural analog of triterpene 3 also in phase II clinical trials for the treatment of HIV, we hypothesized that 28-O-b-D-glucuronide betulinic acid (139) should be a major metabolic product. Thus, we undertook the synthesis of the acyl glucuronide 139 (Gauthier et al 2009e). After many fruitless assays, the synthesis of glucuronide 139 was successfully achieved in good yield (76%) with high stereo-and regioselectivity by the condensation of betulinic acid (3) with the commercially available methyl 2,3,4-tri-O-acetyl-1-bromo-a-D-glucopyranuronate (140) under modified phase-transfer conditions (Fig.…”
Section: Betulinic Acid Glucuronidementioning
confidence: 99%
“…Fraction A (7 g) gave mainly betulinic acid (53.0 mg) 9 and vitexin (11 mg). 10 Fractions B (6 g) were chromatographed on silica gel and eluted with a mixture of nhexane/ethyl acetate of increasing polarity to yield 54 fractions (ca.…”
Section: Extraction and Isolationmentioning
confidence: 99%
“…36 A importância do ácido betulínico (67) estimulou o desenvolvimento de novas atividades de pesquisa na busca, inclusive, de produtos derivados dotados de outras atividades biológicas através de biotransformações químicas 37 ou utilizando, inclusive, novos reagentes e novas reações. [38][39][40][41] Transformações microbiológicas (biotransformações, Esquema 6) para obtenção de substâncias mais ativas e/ou menos tóxicas assumem interesse social e econômico, principalmente quando tais conversões seletivas através de modificações sintéticas revelam dificuldades (Esquema 6). 37 As transformações microbiológicas de substâncias naturais e sintéticas oferecem novos horizontes para modificações estruturais destinadas a vários objetivos, desde a introdução de grupos funcionais a rearranjos moleculares.…”
Section: Substâncias Orgânicas Naturais Anti-hivunclassified
“…Quatro 40 Synthesis, cytotoxicity, and germanicane-type rearrangement products. 41 Outras classes de substâncias naturais têm também revelado potente atividade inibidora sobre HIV, podendo-se citar, como exemplos adicionais, a cumarina 70 42,43 e os flavonoides 7-O-b-D-galactopiranosilacacetina (71) e crisina (72), isolados das flores de Chrysantbermum morifolium (família Compositae) juntamente com mais sete substâncias conhecidas, sendo que a conhecida flavona crisina (72) revelou-se a mais ativa.…”
Section: Substâncias Orgânicas Naturais Anti-hivunclassified