Highly Regioselective Synthesis of 1-Aryl-3 (or 5)-alkyl/aryl-5 (or 3)-(<i>N</i>-cycloamino)pyrazoles
作者:S. Peruncheralathan、A. K. Yadav、H. Ila、H. Junjappa
DOI:10.1021/jo051478u
日期:2005.11.1
An efficient highlyregioselective protocol for the synthesis of isomeric 1,3-diaryl (or 1-aryl-3-alkyl) and 1,5-diaryl (or 1-aryl-5-alkyl)-5 (or 3)-(N-cycloamino)pyrazoles has been reported by cyclocondensation of common α-oxoketene N,S-acetal precursors with arylhydrazines by variation of reaction conditions.
β-alkynic hydrazone and secondaryamine is described. The strategy utilizes KI as an electrolyte in an undivided cell with a constant current, generating the desired products in moderate-to-good yield. The method features selective amination at the 3-position of the pyrazole skeleton. The results indicate that α,β-alkynic hydrazones functionalized with aromatic groups and secondaryamines functionalized with
描述了一种使用 α,β-炔腙和仲胺进行 3-氨基取代吡唑的可用且简单的电介导环化方法。该策略利用 KI 作为未分割电池中的电解质,以恒定电流产生中等至良好产量的所需产品。该方法的特点是在吡唑骨架的3位上进行选择性胺化。结果表明,芳香族基团官能化的α,β-炔腙和富电子基团官能化的仲胺在此转化中具有更好的耐受性。
SCHROTH, W.;SPITZNER, R.;HUGO, S., SYNTHESIS, BRD, 1982, N 3, 199-203