Chemoselectivity and Conformational Analysis of the Reaction of 2-Acetylcycloalkanones with Benzohydrazide: Synthesis and Reduction of 1-Aroylcycloalkapyrazole Derivatives
作者:Constantinos A. Tsoleridis、Julia Stephanidou-Stephanatou、Chara Zika、Minothora Pozarentzi、Stephanos Alevizopoulos
DOI:10.1002/hlca.200390035
日期:2003.2
From the reaction of 2-acetylcyclopentanone and 2-acetyl-2-methylcyclopentanone with benzohydrazide, the 1-benzoyl-6a-hydroxycyclopentapyrazole derivatives 2a and 2b were obtained as the only reaction products, whereas from the reaction of 2-acetylcyclohexanone an epimeric cis/trans mixture of the 2-benzoyl-3-hydroxy-2H-indazole derivative 3c was formed. The dehydration of the isolated compounds 2a
从2-乙酰基环戊酮和2-乙酰基-2-甲基环戊酮与苯并酰肼的反应中,获得了1-苯甲酰基-6a-羟基环戊并吡唑衍生物2a和2b作为唯一的反应产物,而从2-乙酰基环己酮的反应中得到了一个顺式/反式2-苯甲酰基-3-羟基-2-混合物ħ -吲唑衍生物3c中形成。分离的化合物的脱水2A和3C,以及所述的NaBH 4和NaBH 3的CN还原产物2a中进行了研究。衍生化合物的结构分配是通过分析其NMR谱图确定的(1 H,13 C,深度,舒适,噪音,HETCOR CH和COLOC CH)。通过构象分析,MM2和半经验(AM1和PM3)MO计算,研究了1a和1c与苯甲酰肼反应的化学选择性。