摘要:
5,6-dihydro-2-methyl-1,4-oxathiin-3-carboxanilide 的酸水解得到 2-(2-hydroxyethylthio)-acetoacetanilide 烯醇。发现 3-羰基取代的 5,6-二氢-1,4-oxathiins 通过亲核氮攻击 C-2 发生环裂解。因此观察到以下反应: 3-乙酰基-5,6-二氢-2-甲基-1,4-oxathiin 用肼处理得到 4-(2-羟基乙硫基)-3,5-二甲基吡唑,而不是腙。1,4-oxathiins、N-(5,6-dihydro-2-methyl-1,4-oxathiin-3-ylcarbonyl)-N'-phenylurea 和 5,6-dihydro-2-methyl-1,4- oxathiin-3-carboxy hydrazide 重排分别得到 5-(2-hydroxyethylthio)-6-methyl-1-phenyluracil