Viktorya I. Rstakyan

Institute of Chemical Physics NAS Republic of Armenia

In this study, we used Stereolithography to develop tricalcium phosphate-based scaffolds. The feedstock for the process consisted of a UV-curable resin, synthetic tricalcium phosphate, and silicon oxide. The viscosity and curability of the resins are carefully controlled to enable the fabrication of complex-shaped scaffolds. Following stereolithogr...

The present invention relates to a new route of synthesis to obtain pharmaceutically acceptable Vismodegib. In addition, besides the synthesis, also suitable pharmaceutical compositions and the use of the compound for the treatment of basal-cell carcinomas are disclosed.

A process for the preparation daclatasvir or a pharmaceutically acceptable salt thereof, wherein the process includes the synthetic step of reacting a compound of Formula (I) with a compound of Formula (II): Wherein LG is a leaving group and Z is a protecting group. The protecting group Z may be selected from Boc, Cbz, Tosyl, Mesyl, Benzyl, Fmoc, s...

The synthesis of 1-vinyl-3- and 1-vinyl-5-pyrazolcarboxylic acids is developed and the anti burn activity of the chitosan salts of 1-vinyl-3(5)-carboxylic acids is studied.

Alkylation reactions of pyrazoles with ethylene chlorohydrin under phase transfer catalysis were studied. Effect of solvent nature on alkylation process was established. 3(5)-Methylpyrazole alkylation products were isolated and identified.

Reactions of 3,5-dimethyl-1-phenyl-1H-pyrazole with various electrophilic reagents were studied. Electrophilic attack occurred regioselectively at the C4 atom in the pyrazole ring.

It was established that in the 13C NMR spectra of 4-hydroxymethylpyrazoles the carbon atom of hydroxymethyl group of 1,3,5-trimethyl-4-hydroxymethylpyrazole is deshielded by 6.28–6.78 ppm compared to 1-methyl-4-hydroxymethyl-, 1,3-dimethyl-4-hydroxymethyl- and 1,5-dimethyl-4-hydroxymethylpyrazoles. It is assumed that this difference is related to t...

Alkylation reactions of pyrazoles with ethylene chlorohydrin under phase transfer catalysis were studied. Effect of solvent nature on alkylation process was established. 3(5)-Methylpyrazole alkylation products were isolated and identified.

Ambiguous behavior in the bromination of 4-formylpyrazoles [1, 2] and 4-pyrazolecarboxylic acids [3] was mentioned earlier. In the presence of sodium hydroxide the reaction proceeds as substitution of carbonyl (carboxy) group with the bromine atom. 4-Hydroxymethylpyrazole hydroxy group seems to be a convenient functional substituent for purposeful...