Terminal alkynes containing ester, amide or ketone moieties have been reacted with salicylaldehydes in the presence of DABCO affording a direct and single-step method for the regioselective synthesis of 3-substituted 4-hydroxy-4H-chromenes in aqueous 1,4-dioxane. A number of novel chromene derivatives were prepared in good yields using this methodology some of which showed cytotoxic properties when tested against cancer cells.
含有酯、酰胺或酮部分的末端炔与
水杨醛在
DABCO 存在下反应,提供了在 1,4-
二恶烷水溶液中区域选择性合成 3-取代的
4-羟基-4H-色烯的直接一步法。使用这种方法以良好的产率制备了许多新型色烯衍
生物,其中一些在针对癌细胞进行测试时显示出细胞毒性特性。