A dehydrative cross-coupling of 2H-chromene hemiacetals with ketones is described. Without the derivatization of 2H-chromene hemiacetals to 2H-chromene acetals, the direct C–OH/C–H coupling reaction has been accomplished with water as the only by-product. With the use of Sn(OTf)₂ as the promoter, the reaction goes smoothly under mild conditions.

中文翻译：

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锡 (II) 催化的 2H-色烯半缩醛与酮的脱水交叉偶联

描述了 2 H-色烯半缩醛与酮的脱水交叉偶联。在没有将 2 H-色烯半缩醛衍生为 2 H-色烯缩醛的情况下，直接的 C-OH/C-H 偶联反应已经完成，水作为唯一的副产物。使用Sn(OTf) ₂作为促进剂，反应在温和条件下顺利进行。