compounds (VOC) are often still used during workup and isolation of products. Here, a zero-VOC strategy for Knoevenagel reaction is reported. (Hetero)aromatic aldehydes are successfully condensed with rhodanine, thiazolidine-2,4-dione TZD, or barbituric acid under mild conditions in an L-proline-based DES and pure compounds are obtained after hydrolysis without any purification. For the less reactive TZD
低共熔溶剂(DES)是一种环境友好型溶剂,可以避免使用有毒有机溶剂,近年来得到了广泛的研究。然而,在产品的后处理和分离过程中仍然经常使用挥发性有机化合物 (VOC)。本文报道了 Knoevenagel 反应的零 VOC 策略。在温和条件下,(杂)芳香醛与
绕丹宁、
噻唑烷-2,4-二酮 TZD 或
巴比妥酸在
L-脯氨酸基 DES 中成功缩合,
水解后无需任何纯化即可获得纯化合物。对于反应性较低的 TZD,微波激活可以将反应时间从 24 小时缩短至仅 1 小时。