derivatives of betulinic acid (2) and 12 derivatives of platanic acid (3) has been prepared and screened for their cytotoxic activity using SRB assays. First synthetic approaches were focused on the preparation of augustic acid (4) analogs of 2 and 3 by introducing a second hydroxyl group on the A-ring of both triterpenoic acids leading to compounds 5–14. Further structural modifications were performed at
Structural modifications of 2,3-indolobetulinic acid: Design and synthesis of highly potent α-glucosidase inhibitors
作者:Elmira F. Khusnutdinova、Anastasiya V. Petrova、Ha Nguyen Thi Thu、Anh Le Thi Tu、Tra Nguyen Thanh、Cham Ba Thi、Denis A. Babkov、Oxana B. Kazakova
DOI:10.1016/j.bioorg.2019.102957
日期:2019.7
betulonic acid and their α-glucosidase inhibiting activity was investigated. Being a leader compound from our previous study, 2,3-indolo-betulinic acid was used as the main template for different modifications at C-(28)-carboxyl group to obtain cyano-, methylcyanoethoxy-, propargyloxy- and carboxamide derivatives. 20-Oxo- and 29-hydroxy-20-oxo-30-nor-analogues of 2,3-indolo-betulinic acid were synthesized
Synthesis and evaluation of antiviral activities of triterpenic conjugates with 2-aminobutan-1-ol as potent microbicidal agents
作者:Irina A. Tolmacheva、Ekaterina V. Igosheva、Olga V. Savinova、Eugene I. Boreko、Vladimir F. Eremin、Victoria V. Grishko
DOI:10.1007/s00044-019-02401-w
日期:2019.10
triterpenic A ring on the level of antiviral activity of triterpenic C3, C28 amides with a residue of racemic, (S), or (R)-enantiomeric 2-aminobutan-1-ol against herpes simplex viruses type I (HSV-I) and type II (HSV-II), as well as against human immunodeficiency virus type I (HIV-1) was investigated. The 2,3-secolupane racemic amide 5a was selected as a potent microbicidal agent with the highest virus inhibitory
Synthesis of A-ring quinolones, nine-membered oxolactams and spiroindoles by oxidative transformations of 2,3-indolotriterpenoids
作者:Elmira F. Khusnutdinova、Oxana B. Kazakova、Alexander N. Lobov、Olga S. Kukovinets、Kyrill Yu. Suponitsky、Craig B. Meyers、Mark N. Prichard
DOI:10.1039/c8ob02624f
日期:——
spiroindolinones was achieved by the oxidation of 2,3-indolo-28-oxo-allobetulin with dimethyldioxirane that could be explained by the rearrangement of the 2,3-epoxy-intermediate. 19β,28-Epoxy-18α-olean-28-oxo-2-nor-2,3-4'(1H)-quinolone was the most active against HPV-11 with EC50 0.45 μM and SI50 322 in a primary assay and SI90 < 10 against HPV-16 in a secondary assay. The oxidative transformations of indolotriterpenoids
Synthesis of Glycosides of Lupane-Type Triterpene Acids
作者:N. F. Samoshina、M. V. Denisenko、V. A. Denisenko、N. I. Uvarova
DOI:10.1023/b:conc.0000018113.79735.34
日期:2003.11
A preparative synthesis of glucosides of the lupane-type triterpene acids betulinic, dihydrobetulinic, betulonic, dihydrobetulonic. and 3,20-dioxo-30-norlupan-28-oic was proposed. Glycosylation of 3-hydroxyacids by alpha-acetohronioglucose (ABG) with Ag2O was performed in pyridine (Py) to form glycosides at C-28, repeated glycosylation of which by these same reagents but in CH2Cl2 generated a glycoside bond at C-3 to form bisglucosides 28- Glucosides of ketoacids were formed in high yields in both Py and CH2Cl2.