Binuclear pyrazoles. I. Synthesis and cytotoxic activity of 1,1'-dibenzyl and 1,1'-dihydroxymethyl 4,4'-bispyrazoles.
作者:ANAMARIA CUADRO、JOSE ELGUERO、PILAR NAVARRO
DOI:10.1248/cpb.33.2535
日期:——
From 3, 3', 5, 5'-tetramethyl-4, 4'-bis-1 H-pyrazole, 3, 3', 5, 5'-tetramethyl-4, 4'-methylenebis-1 H-pyrazole and 4, 4'-methylenebis-1 H-pyrazole, the corresponding 1, 1'-dibenzyl and 1, 1'-dihydroxymethyl derivatives have been obtained. Benzylation of 1H-bispyrazoles was carried out by treatment with benzyl chloride under phase transfer conditions. Hydroxymethylation was done by treatment with 37% aqueous formaldehyde either in acidic or in neutral medium. All the products obtained have been evaluated as cytotoxic, and 1, 1'-dibenzyl-3, 3', 5, 5'-tetramethyl-4, 4'-bispyrazole is a powerful cytotoxic agent (ED50=7 μM).
从 3, 3', 5, 5'-tetramethyl-4, 4'-bis-1 H-pyrazole, 3, 3', 5, 5'-tetramethyl-4, 4'-methylenebis-1 H-pyrazole 和 4, 4'-methylenebis-1 H-pyrazole 中得到了相应的 1, 1'-dibenzyl 和 1, 1'-dihydroxymethyl 衍生物。1H- 双吡唑的苄基化是在相转移条件下用氯化苄进行的。羟甲基化是在酸性或中性介质中用 37% 的甲醛水溶液进行处理。所有得到的产物都进行了细胞毒性评估,其中 1, 1'-dibenzyl-3, 3', 5, 5'-tetramethyl-4, 4'-bispyrazole 是一种强力细胞毒剂(ED50=7 μM)。