The reactions of α-aminoacetonitriles with isothiocyanates gave 1-cyanomethyl-1,3-disubstituted thioureas or 1,3-disubstituted 4-amino-4-imidazoline-2-thiones depending upon the reaction conditions. In the presence of polar organic solvents such as methanol the former products were easily cyclized to the latter. 1,3-Disubstituted 4-amino-4-imidazoline-2-thiones were autoxidized in methanol affording 1,3-disubstituted 5-imino-2-thiohydantoins.
α-
氨基乙腈与异
硫氰酸酯的反应可以在不同条件下得到1-
氰甲基-1,3-二取代
硫脲或1,3-二取代4-
氨基-4-
咪唑啉-2-
硫酮。在极性有机溶剂如
甲醇的存在下,前者产物容易环化为后者。1,3-二取代4-
氨基-4-
咪唑啉-2-
硫酮在
甲醇中自动氧化生成1,3-二取代5-亚
氨基-2-
硫脲。