Reaction of ketenes with <i>N,N</i>
-disubstituted α-aminomethyleneketones. XIII. Synthesis of 2<i>H</i>
-pyrano[3,2-<i>d</i>
]-1-benzoxepin derivatives
作者:Giulia Menozzi、Luisa Mosti、Pietro Schenone
DOI:10.1002/jhet.5570200310
日期:1983.5
Cycloaddition of dichloroketone to N,N-disubstituted (E)-4-aminomethylene-3,4-dihydro-1-benzoxepin-5(2H)-ones gave N,N-disubstituted 4-amino-3,3-dichloro-3,4,5,6-tetrahydro-2H-pyrano[3,2-d]-1-benzoxepin-2-ones II, which are derivatives of the new heterocyclic system 2H-pyrano[3,2-d]-1-benzoxepin. Dehydrochlorination with triethylamine of II afforded N,N-disubstituted 4-amino-3-chloro-5,6-dihydro-2H-pyrano-[3
将二氯酮环加成到N,N-二取代的(E)-4-氨基亚甲基-3,4-二氢-1-苯并氧杂-5(2 H)-酮上,得到N,N-二取代的4-氨基-3,3-二氯- 3,4,5,6-四氢-2 H-吡喃并[3,2- d ] -1-苯并氧杂-2-酮II,是新杂环系统2 H-吡喃并[3,2- d ]的衍生物-1-苯并e庚因 用II的三乙胺脱氯化氢可得到良好产率的N,N-二取代的4-氨基-3-氯-5,6-二氢-2H-吡喃基-[3,2 - d ] -1-苯并二甲苯-2-酮III 。在IIh(NR 2 =二苯氨基)的三乙胺处理中,3-氯-5,6-二氢-在靠近IIIh的位置以低收率分离出2H-吡喃并[3,2- d ] -1-苯并氧杂-2-酮,而IIc(NR 2 =二异丙基氨基)则以低收率得到4-diisopropylamino-5,6-dihydro-2H -吡喃基(3,2 - d)-1-苯并氧杂-2-酮。