SUBSTITUTED TARAXASTANES USEFUL FOR TREATING VIRAL INFECTIONS
申请人:BRADBURY Barton James
公开号:US20070197646A1
公开(公告)日:2007-08-23
Substituted taraxastanes useful for treating viral infections, are provided herein. Thus, in a first aspect, the invention provides compounds of Formula I
and the pharmaceutically acceptable salts thereof, wherein the variables R
1
, R
2
, and X are defined herein. The compounds described herein are thought to act by inhibiting retroviral maturation, including maturation of encapsulated retroviruses viruses, such as the HIV viruses, HIV-1 and HIV-2. Pharmaceutical compositions comprising such compounds of Formula I are included herein. Methods of using such compounds to treat human patients infected with an HIV virus and reducing the mortality of AIDS are also provided herein.
作者:Raisa Haavikko、Abedelmajeed Nasereddin、Nina Sacerdoti-Sierra、Dmitry Kopelyanskiy、Sami Alakurtti、Mari Tikka、Charles L. Jaffe、Jari Yli-Kauhaluoma
DOI:10.1039/c3md00282a
日期:——
The synthesis of heterocyclic betulin derivatives and their activity against Leishmania donovani is reported. Betulonic acid was used as a versatile intermediate. Several different fused heterocycles were introduced at the 2,3-position of the lupane skeleton including isoxazole, pyrazine, pyridine, indole and pyrazole rings. Also the 28-position was modified. Three compounds, 5, 8 and 25, showed low micromolar
A simple and effective method for formylation of betulin using formic acid and 3a,6a-diphenylthioglycoluril is reported. The yield of betulin diformate was 87%. Allobetulin formate (95%) was prepared by reacting betulin diformate with trifluoroacetic acid. The structures of betulin diformate and allobetulin formate were confirmed by IR and NMR spectroscopy. The antioxidant activity of the synthesized compounds was studied.