Multicomponent Synthesis of Spiro-dihydropyridine Oxindoles <i>via</i> Cascade Spiro-cyclization of Knoevenagel/Aza-Michael Adducts
作者:Basavaraja D、Athira C S、Siddalingeshwar V. D、Ashitha K. T、Sasidhar B. Somappa
DOI:10.1021/acs.joc.2c01063
日期:2022.11.4
An efficient, straightforward, and one-pot synthesis of biologically relevant spiro-dihydropyridine oxindoles was described via readily available isatin, malononitrile, allenoate, and amines. The metal/organocatalyst-free, Et3N-mediated reaction proceeds via cascade spiro-cyclization of in situ generated Knoevenagel/aza-Michael adducts. The reaction has great flexibility over electron-rich and electron-poor
通过容易获得的靛红、丙二腈、联烯酸和胺,描述了一种高效、直接和一锅法合成生物学相关的螺-二氢吡啶羟吲哚。无金属/有机催化剂、Et 3 N 介导的反应通过原位生成的 Knoevenagel/aza-Michael 加合物的级联螺旋环化进行。该反应对富电子和缺电子取代基具有很大的灵活性,能够以良好到极好的收率提供所需的产物。我们还展示了选定的螺二氢吡啶,用于后期多样化,成为具有制药相关性的新型螺二氢吡啶杂化物。