DBU-Catalyzed, facile and efficient method for synthesis of spirocyclic 2-oxindole derivatives with incorporated 6-amino-4H-pyridazines and fused derivatives via [3+3] atom combination
作者:Ismail A. Abdelhamid、Mona H. Mohamed、Amr M. Abdelmoniem、Said A.S. Ghozlan
DOI:10.1016/j.tet.2009.09.081
日期:2009.11
3-Cyanomethylidene oxindole derivatives were prepared in excellent yields utilizing DBU-promoted Knoevenagel condensation of isatin derivatives with active methylene reagents. The isolated products were then reacted with azaenamines via a DBU-promoted Michael addition to yield spirocyclic 2-oxindole derivatives with incorporated 6-amino-4H-pyridazines and their fused derivatives.
利用DBU促进的Isatin衍生物的Knoevenagel缩合反应与活性亚甲基试剂以极好的收率制备了3-Cyanomethylidene oxindole衍生物。然后将分离的产物通过DBU-促进的迈克尔加成与氮杂烯胺反应,得到螺环2-氧吲哚衍生物,其中引入了6-氨基-4 H-哒嗪及其稠合衍生物。