ANRORC rearrangement in tetrahydro-2H-chromenones. Synthesis and structural assignment by NMR, MS, X-ray and DFT calculations of 2-[3(5)-trifluoromethyl-1H-pyrazol-4-yl)arylmethyl]cyclohexenones and derivatives
作者:Helio G. Bonacorso、Jussara Navarini、Liliane M.F. Porte、Everton P. Pittaluga、Andrizia F. Junges、Alexandre R. Meyer、Marcos A.P. Martins、Nilo Zanatta
DOI:10.1016/j.jfluchem.2013.03.014
日期:2013.7
chloride easily converted a pyrazole like 2 to its N-benzyl derivative (4), at 69% yield. Finally, the structural assignment of compounds 2–4 was deduced by mass spectrometry, X-ray crystal diffraction and density functional theory (DFT) calculations, which clearly and unambiguously furnished values very close to those determined from 1H, 13C and 19F NMR data.
本文首先描述了一种新系列3-羟基-2的合成- [(3(5) - (甲基/苯基)-5(3) - (三氟甲基)-1 ħ吡唑-4-基)芳甲基]环己-2-烯-1-酮(2),其中芳基= C 6 H ^ 5,4-NO 2 C ^ 6 ħ 4,4-OCH 3 C ^ 6 ħ 4,从3-酰基的ANRORC环转化反应-4-芳基-2-(三氟甲基)-2-羟基-3,4,7,8-四氢-2- ħ -苯并吡喃5(6 ħ)-一(1),在水合肼存在下,酰基=乙酰基和苯甲酰基,产率63-90%。在随后的步骤,从2-氧化芳构化反应在碘/甲醇介质做了的3(5)三氟甲基- 5(3) -甲基- 4的制备- [(2,6-二甲氧基苯基) - (4-甲氧基苯基甲基)] - 1 H ^吡唑(3)在72%的产率。此外,使用苄基氯烷基化反应容易地转化的吡唑类2以它的Ñ -苄基衍生物(4)中,在69%收率。最后,化合物2-4的结构分配通过质谱法,