I 族和 II 族金属的卤化物或拟卤化物与氨基甲酸酯保护的氮丙啶和氮杂环丁烷在作为溶剂的液体二氧化硫中的反应导致这些杂环的有效开环。二氧化硫作为一种高极性溶剂,可溶解无机盐并充当温和的路易斯酸以加速开环。因此,可以使用氨基甲酸酯保护的小杂环代替相应的磺酰胺,其活性在开环反应中得到很好的证实。硫醇在 SO2 辅助的氮丙啶开环中也表现良好。该过程没有立体中心的外消旋化。
Résumé Acylimidodicarbonates obtained from aziridine-2-carboxamides through Davidsen bis-Boc activation react with amine nucleophiles under mild conditions to form tertiary aziridine-2-carboxylic acid amides. NH aziridine-2-carboxylic acid amides were obtained by hydrogenolythic deprotection of N-Cbz derivatives. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.doc
The reactions of halides or pseudohalides of group I and II metals with carbamate-protected aziridines and azetidines in liquid sulfur dioxide as solvent resulted in the efficientring-opening of these heterocycles. Sulfur dioxide, as a highly polar solvent, solubilizes the inorganic salts and acts as a mild Lewis acid to accelerate the ring-opening. For this reason, carbamate-protected small heterocycles
I 族和 II 族金属的卤化物或拟卤化物与氨基甲酸酯保护的氮丙啶和氮杂环丁烷在作为溶剂的液体二氧化硫中的反应导致这些杂环的有效开环。二氧化硫作为一种高极性溶剂,可溶解无机盐并充当温和的路易斯酸以加速开环。因此,可以使用氨基甲酸酯保护的小杂环代替相应的磺酰胺,其活性在开环反应中得到很好的证实。硫醇在 SO2 辅助的氮丙啶开环中也表现良好。该过程没有立体中心的外消旋化。