Unexpected Formation of Thiophene-annulated Tetrahydro-3- benzazepines by Alkylation of Thiolactams with Ethyl Bromoacetate
作者:Soumya Sarkar、Roland Fröhlich、Bernhard Wünsch
DOI:10.5560/znb.2013-3030
日期:2013.3.1
synthesize enantiomerically pure tetrahydro-3-benzazepines with diverse substitution patterns, the lactams 3 were converted into thiolactams 4 upon treatment with Lawesson’s reagent. Instead of an Eschenmoser sulfide contraction a thiophene annulation reaction occurred, when the thiolactams 4 were reacted with ethyl bromoacetate. Altogether, enantiomerically pure thiopheneannulated 3-benzazepines 7 were prepared
为了合成具有不同取代模式的对映异构纯四氢-3-苯并氮杂,内酰胺 3 在用劳森试剂处理后转化为硫内酰胺 4。当硫内酰胺 4 与溴乙酸乙酯反应时,发生噻吩环化反应而不是 Eschenmoser 硫化物收缩。总之,对映异构纯的噻吩环化 3-苯并氮杂 7 从市售邻苯二乙酸开始,以非常短的反应顺序(五个反应步骤)制备。