Synthesis of Soai Type 2-Arylpyrimidine-5-carbaldehydes through Desulfurative Cross-Coupling with Arylboronic Acids
作者:Oleg V. Maltsev、Rodger Rausch、Zheng-Jun Quan、Lukas Hintermann
DOI:10.1002/ejoc.201403133
日期:2014.11
A two-step synthesis of 2-arylpyrimidine-5-carbaldehydes, which are of relevance as substrates for Soai's asymmetric autocatalysis, was realized by exploiting a hidden threefold symmetry in the target core structure. Condensation of Arnold's C3-symmetric vinamidinium cation with S-methylisothiouronium sulfate provides 2-methylsulfanyl-pyrimidine-5-carbaldehyde; introduction of aryl groups at C-2 of
通过利用目标核心结构中隐藏的三重对称性,实现了 2-芳基嘧啶-5-甲醛的两步合成,其与 Soai 的不对称自催化的底物相关。Arnold 的 C3-对称 vinamidinium 阳离子与 S-甲基异硫脲硫酸盐缩合得到 2-甲基硫基-嘧啶-5-甲醛;在后者的 C-2 处引入芳基是通过 Liebeskind-Srogl 钯催化的脱硫(脱甲基硫酰化)与芳基硼酸偶联来完成的,以获得目标化合物 1(14 个实例,60-95% 产率)。