An economical one-pot, three-step reaction sequence of readily available 2-monosubstituted 1,3-diketones and 1,4-benzoquinones has been explored for the facile access of 2,3-dialkyl-5-hydroxybenzofurans. By using cheap K₂CO₃ and conc. HCl as the reaction promoters, the reaction occurs smoothly via sequential Michael addition, aromatization, retro-Claisen, deacylation, hemiketalization, and dehydration processes under mild conditions in a practical manner. Additionally, an interesting phenomenon was observed during the derivatization studies, where the dihydroquinoline was converted into tetrahydroquinoline and quinoline products, respectively, via a disproportionation process.

中文翻译：

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通过2-单取代1,3-二酮和1,4-苯醌的一锅三步反应序列合成2,3-二烷基-5-羟基苯并呋喃

为了方便地获得 2,3-二烷基-5-羟基苯并呋喃，我们探索了一种经济的一锅三步反应序列，由容易获得的 2-单取代 1,3-二酮和 1,4-苯醌组成。通过使用廉价的 K ₂ CO ₃和浓缩物。以HCl为反应促进剂，通过连续的迈克尔加成、芳构化、逆克莱森、脱酰化、半缩酮化和脱水等过程，反应在温和条件下顺利进行，实用性强。此外，在衍生化研究过程中观察到一个有趣的现象，即二氢喹啉通过歧化过程分别转化为四氢喹啉和喹啉产物。