Heterocyclic synthesis containing bridgehead nitrogen atom: Synthesis of 3-[(2H)-2-oxobenzo[b]pyran-3-yl]-s-triazolo[3,4-b]-1,3,4-thiadiazine and thiazole derivatives
作者:M. A. Raslan、M. A. Khalil
DOI:10.1002/hc.10109
日期:——
2,4-tiazole (4) and thiazole 7 derivatives, respectively. Condensation of 4 with substituted phenacyl bromide and/or chloranil gave 1,2,4-triazole[3,4-b]thiadiazine (5a,b) and 3,10-bis-[2H-2-oxobenzo[b]pyran-3-yl]-6,13-dichloro-bis-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazino[5′,6′-b:5′,6′-e]cyclohexa-1,4-diene (6), respectively. Cyclization of thiosemicarbazide 10 by refluxing it in sodium hydroxide and/or
2H-2-氧代苯并[b]吡喃-3-酰肼(2)与二硫化碳在碱性DMF中反应生成硫代氨基甲酸钾3,其与肼和/或苯甲酰溴反应后容易发生杂环化生成1,2,分别为 4-噻唑 (4) 和噻唑 7 衍生物。4 与取代的苯甲酰溴和/或氯苯醌缩合得到 1,2,4-三唑 [3,4-b] 噻二嗪 (5a,b) 和 3,10-双-[2H-2-氧代苯并[b]吡喃- 3-基]-6,13-二氯-双-1,2,4-三唑并[3,4-b]-1,3,4-噻二嗪并[5',6'-b:5',6'- e]环己-1,4-二烯(6),分别。通过在氢氧化钠和/或磷酰氯中回流使氨基硫脲 10 环化,分别得到三唑 13 和噻二唑 15 衍生物。此外,10在无水乙酸钠存在下与苯甲酰溴反应得到氧噻唑烷衍生物17。合成化合物的结构通过元素分析、IR、1H NMR和质谱证实。© 2003 Wiley Periodicals, Inc. 杂原子化学 14:114–120