4H-benzo[b]pyrans were obtained rapidly in high yields using triethanolamine as an efficient, eco-friendly and low-cost basic catalyst. One-pot three-component condensation reaction of a series of aldehydes, malononitrile and 1,3-diketones was performed at room temperature. All the products were obtained in high-to-excellent yields and characterized in detail. Green, rapid and mild process, very short reaction times (1–12 min) and simple workup are some of the advantages of this method.

中文翻译：

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在环境条件下使用三乙醇胺作为有效的均相催化剂快速绿色合成4H-苯并[b]吡喃

使用三乙醇胺作为高效，环保和低成本的碱性催化剂，可以快速高产率地获得4H-苯并[b]吡喃。在室温下进行一系列醛，丙二腈和1,3-二酮的一锅三组分缩合反应。所有产品均以极高的出品率获得并进行了详细表征。绿色，快速，温和的过程，非常短的反应时间（1-12分钟）和简单的后处理是该方法的优点。