作者:Maurice Armand Corbeil、Michael Curcumelli-Rodostamo、Robert James Fanning、Bruce Allan Graham、Marshall Kulka、James Benjamin Pierce
DOI:10.1139/v73-401
日期:1973.8.15
etoacetanilide enol. 3-Carbonyl-substituted 5,6-dihydro-1,4-oxathiins were found to undergo ring cleavage by nucleophilic nitrogen attack on C-2. Thus the following reactions were observed: 3-acetyl-5,6-dihydro-2-methyl-1,4-oxathiin on treatment with hydrazine gives 4-(2-hydroxyethylthio)-3,5-di-methylpyrazole, instead of the hydrazone. The 1,4-oxathiins, N-(5,6-dihydro-2-methyl-1,4-oxathiin-3-ylc
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