Herein, we report a catalytic reductive three-component annulation reaction for the construction of fused heterocycles featuring a pyrano[2,3-b]pyridyl motif from N-heteroarenium salts and formaldehyde with cyclic 1,3-diketones or 4-hydroxycoumarins.
在这里,我们报道了一种催化还原三组分环化反应,用于从N-杂环
铵盐和
甲醛与环状1,3-二酮或
4-羟基
香豆素构建具有
吡喃[2,3-b]
吡啶基团的融合
杂环化合物。