A new, one‐pot, simple thermally efficient and solvent‐free method for the preparation of 7‐alkyl‐6H,7H‐naphtho[1′,2′:5,6]pyrano[3,2‐c]chromen‐6‐ones by condensation of β‐naphthol, aromatic aldehydes, and 4‐hydroxycoumarin using Zr(HSO4)4 as a safe and efficient catalyst is described. This method has the advantages of high yields, a cleaner reaction, simple methodology, short reaction times, easy workup
一种新的,单罐,简单高热效率和无溶剂法7烷基-6-的制备ħ,7 ħ -
萘并[1',2':5,6]
吡喃并[3,2- C ^ ]苯并
吡喃描述了通过使用Zr(HSO 4)4作为安全有效的催化剂将β-
萘酚,芳族醛和
4-羟基
香豆素缩合生成的-6-酮。该方法具有收率高,反应更清洁,方法简单,反应时间短,后处理容易,绿色环保的优点。J.杂环化学。(2011)。