作者:Yasuhisa Kohara、Keiji Kubo、Eiko Imamiya、Takehiko Naka
DOI:10.1002/jhet.5570370603
日期:2000.11
The reaction of amidoximes 1 with 1,1′-thiocarbonyldiimidazole (TCDI) followed by treatment with silica gel or boron trifluoride diethyl etherate (BF3·OEt2) provided 3-substituted 4,5-dihydro-5-oxo-1,2,4-thiadiazoles 2 in moderate yields. The Lewis acids are considered to promote the rearrangement of the thioxocarbamate intermediates 5 to the thiol carbarn ate intermediates 7, which cyclize to afford
mid胺肟1与1,1'-硫代羰基二咪唑(TCDI)的反应,然后用硅胶或三氟化硼二乙基醚化物(BF 3 ·OEt 2)处理,得到3-取代的4,5-二氢-5-氧代-1,2 ,4-噻二唑2的产量中等。认为路易斯酸可促进硫代氨基甲酸酯中间体5重排为巯基碳酸盐中间体7,后者环化生成4,5-二氢-5-氧代1,2,4-噻二唑2。