An efficient and simple synthetic approach has been developed for the preparation of biologically interesting spiro[oxindole-3,4'-(4′H-pyran)] derivatives via visible light-mediated one-pot, three-component reaction of isatins, 1,3-dicarbonyl compounds and malononitrile by using an inexpensive organic dye, Na₂ eosin Y, as the photocatalyst in aqueous ethyl lactate at ambient temperature. The substrate scope of this three-component reaction is expanded to linear 1,3-dicarbonyl compounds as viable starting materials. All rights reserved.

中文翻译：

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曙红Y催化可见光下一锅合成螺[4 H-吡喃-羟吲哚]

一种高效和简单的合成方法已被开发用于生物有趣螺的制备[羟吲哚3,4' - （4' ħ吡喃）]通过可见光介导的单罐，靛红的三组分反应衍生物，1-在环境温度下，使用廉价的有机染料Na ₂曙红Y作为光催化剂，在乳酸乙酯水溶液中制备1,3-二羰基化合物和丙二腈。这种三组分反应的底物范围扩大到线性1,3-二羰基化合物作为可行的起始原料。版权所有。