Utility of α-Oxoketene and α-Cyanoketene Thioacetals in Heterocyclic Syntheses: Synthesis of Some New Benzothiazepine Derivatives
作者:Mounir A. A. Mohamed
DOI:10.1080/00397910903538644
日期:2011.1.25
Benzo[b][1,5]thiazepines 1a or 1b were prepared via reaction of o-aminothiophenol with 3-(bis(methylthio)methylene)-pentane-2,4-dione or 2-(bis(methylthio)methylene)-3-carbonitrile, respectively. Reaction of compound 1a with malononitrile afforded pyrano[4,3-b]benzothiazepine 2a, which underwent cyclization into pyrido[4,3-b][1,5]benzothiazepine 2b. Also, reaction of compound 1a with ethyl cyanoacetate
苯并[b][1,5]硫氮杂1a或1b是通过邻氨基苯硫酚与3-(双(甲硫基)亚甲基)-戊烷-2,4-二酮或2-(双(甲硫基)亚甲基)-反应制备的分别为 3-腈。化合物 1a 与丙二腈反应得到吡喃并[4,3-b]苯并噻嗪 2a,然后环化为吡啶并[4,3-b][1,5]苯并噻嗪 2b。此外,化合物 1a 与氰基乙酸乙酯反应得到吡喃并 [4,3-b][1,5] benzothiazepin-3-one 3。化合物 1a 与肼、苯肼或羟胺反应得到相应的唑并苯并噻嗪类化合物 4-6,分别。化合物 1a 与乙二胺反应得到 1,5-苯并噻嗪-乙酮 7,其环化为 [1,4] 二氮杂[5,6-b][1,5] 苯并噻嗪 8。此外,化合物 1b 与乙酰丙酮或乙酰乙酸乙酯得到吡喃并[4,3-b][1,5]苯并硫氮杂 9a 或 9b,它们与乙酸铵反应,分别得到吡喃并[4,3-b][1,5]-苯并硫氮杂 10a 或吡啶并