HALOACETYLATED ENOL ETHERS: 16[5] REGIOSPECIFIC SYNTHESIS OF 5-TRICHLOROMETHYL-PYRAZOLES
作者:Alex F. C. Flores、Marcos A. P. Martins、Adriano Rosa、Darlene Correia Flores、Nilo Zanatta、Helio G. Bonacorsso
DOI:10.1081/scc-120004150
日期:2002.1
ABSTRACT The regiospecific synthesis and isolation of three series of 5-trichloromethyl-pyrazoles 2f–j, 3a–j and 4a–j from the cyclocondensation of 1,1,1-trichloro-4-alkoxy-3-alken-2-ones (1a–f) or trichloroacetyl containing β-diketones (1g–j) with dry hydrazine and phenyl-hydrazine is reported. It was established by 1H- and 13C-NMR spectroscopy that the 5-hydroxy-5-trichloromethyl-4,5-dihydro-1H-pyrazole
摘要 从 1,1,1-trichloro-4-alkoxy-3-alken-2-ones 的环缩合反应中区域特异性合成和分离了三个系列的 5-三氯甲基-吡唑 2f-j、3a-j 和 4a-j( 1a-f) 或含三氯乙酰的 β-二酮 (1g-j) 与干燥的肼和苯肼被报道。通过 1H- 和 13C-NMR 光谱确定 5-羟基-5-三氯甲基-4,5-二氢-1H-吡唑中间体 2a-j 是定量形成的。