The synthesis of hexahydrooxoepithiopyridinedicarboxyimide (5: X2 = N-Ph) by the reaction of thioamides 1 with N-substituted maleimide (2a) was examined. The reaction of primary thioamides, such as thiobenzamide and p-toluthioamide with N-phenylmaleimide gives compounds 5 together with corresponding 4-hydroxy-1,3-thiazoles 4. However, a similar reaction of secondary thioamides, such as N-methylthioacetamide
考察了通过
硫酰胺1与N-取代的马来
酰亚胺(2a)的反应合成六氢氧杂苯并
硫代
吡啶二羧基
酰亚胺(5:X 2=N- Ph)。伯
硫代酰胺,例如
硫代苯甲酰胺和对
甲苯硫代酰胺与N-苯基马来
酰亚胺的反应,得到化合物5和相应的
4-羟基-1,3-
噻唑4。但是,仲
硫代酰胺(例如N-甲基
硫代乙酰胺,
硫代苯甲酰
苯胺)与N-苯基马来
酰亚胺的类似反应无法提供化合物5不加酸。还研究了5的反应途径和构型。