Spiro heterocyclic compounds. III. Synthesis of spiro[oxindole-3,4'-(4'H-pyran)] compounds.
作者:KIMIO HIGASHIYAMA、HIROTAKA OTOMASU
DOI:10.1248/cpb.28.648
日期:——
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)。