Synthesis and hetero-Diels–Alder reactions of (E)-α-perfluoroalkanesulfonyl-α,β-unsaturated ketones
作者:Chunhui Xing、Xianfu Li、Shifa Zhu、Jingwei Zhao、Shizheng Zhu
DOI:10.1016/j.tetlet.2006.04.156
日期:2006.7
Knoevenagel reactions of β-keto perfluoroalkanesulfones 1 with aromatic aldehydes 2 afforded α-perfluoroalkanesulfonyl-α,β-unsaturated ketones 4 in moderate to good yields. The possible mechanism for the reactions was proposed. These fluorine-containing α,β-unsaturated ketones, which are electron-poor 1-oxa-1,3-butadienes, could be used in inverse electron demand hetero Diels–Alder (HDA) reaction with electron-rich
β-酮全氟链烷砜1与芳族醛2的Knoevenagel反应在乙酸铵的催化下,以中等至良好的收率得到α-全氟链烷磺酰基-α,β-不饱和酮4。提出了可能的反应机理。这些含氟的α,β-不饱和酮是贫电子的1-oxa-1,3-丁二烯,可用于逆电子需求杂Diels-Alder(HDA)与富电子烯烃的反应,得到四取代的二氢吡喃定量产量为6。