Regioselective Synthesis of 4-Nitro- or 4-Chloro-Tetrasubstituted Pyrazoles from Hydrazones and β-Halo-β-nitrostyrenes
作者:Xiaohu Deng、Jimmy T. Liang、Neelakandha S. Mani
DOI:10.1002/ejoc.201301294
日期:2014.1
We report an acid-catalyzed cycloaddition reaction of hydrazones with β-bromo- or β-chloro-β-nitrostyrenes for the regioselectivesynthesis of 4-nitro- or 4-chloro-tetrasubstitutedpyrazoles. Arising from a common 4-halo-4-nitropyrazolidine intermediate, the identity of the pyrazole product formed is dependent on the relative leaving group abilities of the halo and nitro substituents.
The invention relates to compounds of formula (I) for use in the prevention and/or treatment of viral infections:
Wherein X, Y, Z, T, R1a and R1b are as defined in claim 1.
The novel title compounds 6 and 7 were conveniently synthesized by a facile two-step route starting from (2-chloro-2-nitroethenyl)benzenes 2 via the base-induced cyclopropanations of the intermediate 2-(2-chloro-2-nitro-1-phenylethyl)cyclohexanones 3 and 4.
The invention relates to a series of compounds with particular activity as inhibitors of the serine-threonine kinase AKT. Also provided are pharmaceutical compositions comprising same as well as methods for treating cancer.