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。