Methyl 1-cyano-2-methylthio-3-nitrocrotonate, 1-phenyl-2-methylthio-3-nitrocrotonitrile, and 1-cyano-2-methylthio-3-nitrocrotonamide, which contain cyano and nitro group at 1-and 3-position, were refluxed in MeOH or EtOH to give 2-hydroxy-3-methylthio-5-oxopyrroline derivatives, with ring closure between cyano and nitro group. The reaction of methyl 1-cyano-2-methylthio-3-nitrocrotonate with equimolar amount of amine gave methyl 2-hydroxy-3-amino-5-oxopyrroline-4-carobxylate which was replaced methylthio with amino group and with ring closure. However, with excess amine gave amine salt of nitro group, and also replaced with methylthio group. The raction of pyrroline derivatives with active methylene compounds gave the corresponding substituted compounds.
将 1-
氰基-2-甲
硫基-
3-硝基
巴豆酸甲酯、1-苯基-2-甲
硫基-
3-硝基
巴豆腈和 1-
氰基-2-甲
硫基-
3-硝基
巴豆酰胺在 MeOH 或 EtOH 中回流,得到 2-羟基-3-甲
硫基-5-氧代
吡咯啉衍
生物,
氰基和硝基之间闭环。将 1-
氰基-2-甲
硫基-
3-硝基
巴豆酸甲酯与等摩尔量的胺反应,可得到 2-羟基-3-
氨基-5-氧代
吡咯啉-4-
甲酸甲酯。然而,过量的胺会产生
硝基胺盐,也会被甲
硫基取代。
吡咯啉衍
生物与活性亚甲基化合物的反应生成了相应的取代化合物。