Study of regioselectivity of reactions between 3(5)-aminopyrazoles and 2-acetylcycloalkanones
作者:A. A. Petrov、A. N. Kasatochkin、E. E. Emelina
DOI:10.1134/s1070428012080131
日期:2012.8
Regioselectivity was examined of reactions between nine 3(5)-aminopyrazoles and 2-acetylcyclopentanone and 2-acetylcyclohexanone under various conditions. A series of cyclopenta[e]pyrazolo-[1,5-a]pyrimidines was obtained. The highest regioselectivity of the reaction was observed in alcohol at 20A degrees C in the presence of a catalytic quantity of trifl uoroacetic acid. The regiostructure of compounds was established by H-1 and C-13 NMR spectroscopy.
A facile method for the synthesis of steroidal and nonsteroidal 5-methyl pyrazolo[1,5-a]pyrimidines
作者:Partha Pratim Kaishap、Swagata Baruah、Kommuri Shekarrao、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1016/j.tetlet.2014.04.011
日期:2014.5
The steroidal and nonsteroidal 5-methyl pyrazolo[1,5-a]pyrimidines were synthesized by the reaction of steroidal/nonsteroidal α,β-unsaturated ketones and 3-amino-1H-pyrazoles/5-amino-1H-pyrazoles in the presence of KOtBu in ethanol under reflux condition.
甾体和非甾体的5-甲基吡唑并[1,5- a ]嘧啶是通过甾体/非甾体α,β-不饱和酮与3-氨基-1 H-吡唑/ 5-氨基-1 H-吡唑的反应合成的。回流条件下乙醇中存在KO t Bu。