Hydroxyl assisted, efficient, transition-metal free and direct C-arylation of 3-hydroxychromone and 5-hydroxy pyran-4-one moieties in the presence of a base, air as an oxidant and arylhydrazines as arylating agents to furnish highly biologically active 3-hydroxyflavones and 2-phenyl-3-hydroxy pyran-4-ones has been developed.
在碱的存在下,利用羟基辅助、高效、无过渡金属参与的直接3-羟基香豆素和5-羟基吡喁-4-酮基团的C-芳基化反应,以空气作为氧化剂,芳基肼作为芳基化试剂,合成了具有高生物活性的3-羟基黄酮和2-苯基-3-羟基吡喁-4-酮。