Spiro[oxindole-3, 4'-(4'H-pyran)]compounds (IIIa-j), were prepared by the Michael reaction of 3-cyanomethyleneoxindoles (Ia, b) with active methylene compounds. Similarly, the reactions of (Ib, c) with cyclic active methylene compounds, e.g. cyclohexane-1, 3-dione, 3-methyl-1-phenyl-5-pyrazolone and barbituric acid, afforded the corresponding spiro compounds (V-VII) containing the condensed pyran system.
Spiro[氧
吲哚-3, 4'-(4'H-
吡喃)]化合物(IIIa-j)是通过3-
氰甲亚甲基氧
吲哚(Ia, b)与活性亚甲基化合物的迈克尔反应制备的。同样,(Ib, c)与环状活性亚甲基化合物的反应,例如
环己烷-1, 3-二酮、3-甲基-1-苯基-5-
吡唑酮和
巴比妥酸,得到了相应的含有缩合
吡喃体系的螺旋化合物(V-VII)。