Photochemistry of pyrimidin-2(1H)-ones: intramolecular γ-hydrogen abstraction by the nitrogen of the imino group
作者:Takehiko Nishio、Satoshi Kameyama、Yoshimori Omote
DOI:10.1039/p19860001147
日期:——
1-aryl-4-(3-ethoxypropyl)-6-methylpyrimidin-2(1H)-ones (1b–d) gave the photoelimination products, 1-aryl-4,6-dimethylpyrimidin-2(1H)-ones (2a–d), via intramolecular γ-hydrogen atom abstraction of the excited imino nitrogen of the starting pyrimidin-2(1H)-one (1), in addition to the 1,3-diazabicyclo[2.2.0]hex-5-en-2-ones (3a–d). The pyrimidin-2(1H)-ones (1f) and (1h), which have no γ-hydrogens at the C-4 position
照射1-芳基-4-丙基-(1a)和1-芳基-4-(3-乙氧基丙基)-6-甲基嘧啶-2(1 H)-ones(1b – d),得到光消除产物1-芳基-4,6-二甲基嘧啶-2(1 H)-一个(2a – d),另外还通过起始嘧啶-2(1 H)-一个(1)的激发亚氨基氮的分子内γ-氢原子提取1,3-二氮杂双环[2.2.0] hex-5-en-2-ones(3a – d)。嘧啶2(1 H)-ones(1f)和(1h)在C-4位置上没有γ氢,对其进行光化学电环化反应,以得到1,3-二氮杂双环[2.2.0] hex-5-en-2-ones(3f)和(3h)产品。