Synthesis of substituted benzoates using a rhodium-mediated Hopf cyclization of 1,3-dien-5-ynes accessed from 2-pyrones
作者:Kristen E. Gardner、Richmond Sarpong
DOI:10.1016/j.tetlet.2022.154272
日期:2023.1
2-pyrones is described. Highlighted is a 2-pyrone remodeling strategy in which a 3-alkynyl-2-pyrone is selectively opened in a 1,6-fashion using sodium cyanide to provide dienynes that upon treatment with sub-stoichiometric amounts of [Rh(CO)2Cl]2 at elevated temperature furnish the desired benzoate.
描述了从 1,3-dien-5-ynes 合成取代的苯甲酸酯,这些 1,3-dien-5-ynes 很容易从 2-pyrones 获得。突出显示的是 2-pyrone 重塑策略,其中使用氰化钠以 1,6-方式选择性地打开 3-alkynyl-2-pyrone 以提供二烯,在用亚化学计量的 [Rh(CO) 2 Cl处理后] 2在升高的温度下提供所需的苯甲酸盐。