Tyrosinase is a multifunctional, glycosylated and copper-containing oxidase which catalyzes the first two steps in mammalian melanogenesis and is responsible for enzymatic browning reactions in damaged fruits during post-harvest handling and processing. Neither hyperpigmentation in human skin nor enzymatic browning in fruits are desirable. These phenomena have encouraged researchers to seek new potent
A series of new pyrazolo[4,3-e][1,2,4]triazine acyclonucleosides 2–5 and 8 were prepared and evaluated for their anticancer activity against human cancer cell lines (MCF-7, K-562) and CDK2/E, as well as Abl protein kinases inhibitors. Lipophilicity of the compounds was determined using C-18 and immobilized artificial membrane (IAM) chromatography. In order to confirm the molecular structures and synthesis
Synthesis of Aza-Analog of N-Methylated Acycloformycin A
作者:Mariusz Mojzych、Andrzej Rykowski
DOI:10.3987/com-07-11142
日期:——
Starting from 3-methyl-5-methylsulfanyl-1H-pyrazolo[4,3-e][1,2,4]triazine (1) by reaction with methyl iodide, subsequent oxidation, ipso-substitution with hydrazine and reaction with yellow mercury (H) oxide 1,3-dimethyl-1H-pyrazolo[4,3-e][1,2,4]triazine (14) is prepared. Further radical bromination and treatment with ethylene glycol in the presence of potassium carbonate afforded 3-(2-hydroxy-ethoxymethyl)-1-methyl-1H-pyrazolo[4,3-e][1,2,4]triazine (16) as aza-analog of N-methylated acycloformycin A.
DIRECT SYNTHESIS OF PYRAZOLO[4,3-e][1,2,4]TRIAZINE DERIVATIVES FROM OXIMES OF 5-ACYL AND 5-FORMYL-1,2,4-TRIAZINES
作者:Mariusz Mojzych、Andrzej Rykowski
DOI:10.1515/hc.2006.12.3-4.191
日期:2006.1
Mojzych, Mariusz, Journal of the Chemical Society of Pakistan, 2011, vol. 33, # 5, p. 698 - 702