Cycloisomerization of acetylenic oximes and hydrazones under gold catalysis: Synthesis and cytotoxic evaluation of isoxazoles and pyrazoles
作者:J C JEYAVEERAN、CHANDRASEKAR PRAVEEN、Y ARUN、A A M PRINCE、P T PERUMAL
DOI:10.1007/s12039-015-0993-9
日期:2016.1
The synthesis of substituted isoxazoles and pyrazoles through a general cycloisomerization methodology has been reported. The capability of gold(III) chloride to promote cycloisomerization of both α, β-acetylenic oximes and α, β-acetylenic hydrazones is the centrepiece of the strategy. A range of acetylenic precursors were investigated to afford 28 examples of the products with good to excellent chemical yields. Selected compounds were screened for their cytotoxic potential towards COLO320 cancer cell lines. The IC50 values of the tested compounds were in the micromolar range, with the best compound, 5-(6-Methoxy-naphthalen-2-yl)-3-phenyl-isoxazole (3h) displaying an IC50 of 38.9 μM. For this compound, the crystal structure in complex with Aurora-A kinase was obtained which revealed details of its binding mode within the active site with a free energy of binding -9.54 kcal/mol.
通过一种通用的环异构化方法,已经报道了取代异恶唑和吡唑的合成。金(III)氯化物促进α,β-炔基肟和α,β-炔基脒的环异构化的能力是该策略的核心。研究了一系列炔基前体,以良好的至优秀的化学收率得到了28个产物实例。选定的化合物对COLO320癌细胞系的细胞毒性潜力进行了筛选。测试化合物的IC50值在微摩尔范围内,其中最佳化合物5-(6-甲氧基萘-2-基)-3-苯基异恶唑(3h)的IC50值为38.9 μM。对于该化合物,获得了与Aurora-A激酶复合的晶体结构,揭示了其在活性位点内的结合模式,结合自由能为-9.54 kcal/mol。