Reactions of α-Aminoacetonitriles with Isothiocyanates. Synthesis of 1,3-Disubstituted 5-Imino-2-thiohydantoins
作者:Takeshi Kinoshita、Hiroko Watanabe、Sadao Sato、Chihiro Tamura
DOI:10.1246/bcsj.53.442
日期:1980.2
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。