3H-Naphtho[2.1-b]pyran-2-carboxamides (3H-Benzo[f]chromene-2-carboxamides) can be synthesized from a three-component cyclocoupling reaction of β-naphthol, propargyl alcohols and isocyanide in the presence of ZnI₂ and FeCl₃ under air atmosphere. The reaction is proposed to involve the formation of aryl-zinc (II) σ-bond and its α-addition to isocyanide.

中文翻译：

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在路易斯酸存在下由β-萘酚，炔丙醇和异氰酸酯的环偶联反应合成3 H-萘[2.1 - b ] pyran -2-羧酰胺

在存在条件下，由β-萘酚，炔丙醇和异氰化物的三组分环偶联反应可合成3 H-萘[2.1- b ]吡喃-2-羧酰胺（3 H-苯并[ f ]铬烯-2-羧酰胺）空气中ZnI ₂和FeCl ₃的含量。提出该反应涉及芳基-锌（II）σ键的形成及其与异氰酸酯的α-加成。