Abstract An efficient stereoselective three-component reaction for the synthesis of functionalized spiro[4H-pyran-3,3′-oxindole] derivatives was realized through an organocatalyzed domino Knoevenagel/Michael/cyclization reaction using a cinchonidine-derived thiourea as the catalyst. Using water as the additive was found to improve the product ee values significantly. Under the optimized conditions
摘要 以
辛可尼丁衍生的
硫脲为催化剂,通过有机催化的多米诺克诺韦纳格尔/迈克尔/环化反应,实现了一种有效的立体选择性三组分反应,用于合成功能化螺[
4H-吡喃-3,3'-羟
吲哚]衍
生物。发现使用
水作为添加剂可以显着提高产品ee值。在优化的条件下,
靛红、
丙二腈和 1,3-二羰基化合物之间的反应以良好的产率 (71–92%) 和中到高的 ee 值 (高达 87% ee) 产生所需的螺
吲哚产物。图形概要