Preparation of New Nitrogen-Bridged Heterocycles. 37. Synthesis and Rearrangement of Full-Conjugated Oxepino[2,3-<i>b</i>]indolizine Derivatives
作者:Akikazu Kakehi、Suketaka Ito、Hideyuki Muranaka
DOI:10.1246/bcsj.67.2795
日期:1994.10
compounds were first synthesized in considerably good yields by acid-catalyzed dehydration of the corresponding ethyl 2-arylcarbonyl-3-hydroxy-3-phenyl-2,3-dihydrooxepino[2,3-b]indolizin-4-carboxylate derivatives with methanesulfonic acid in boiling chloroform. Although these full-conjugated oxepino[2,3-b]indolizines with a nonaromatic 16π electron system were stable at room temperature, upon heating them
标题化合物首先通过酸催化脱水相应的 2-芳基羰基-3-羟基-3-苯基-2,3-二氢氧杂[2,3-b]indolizin-4-carboxylate衍生物以相当好的收率合成甲磺酸在沸腾的氯仿中。尽管这些具有非芳香族 16π 电子系统的全共轭氧杂[2,3-b] 吲哚嗪在室温下是稳定的,但在沸腾的乙醇中加热后,它们会顺利地重排为乙基 2-芳基羰基-1-氧代-2-苯基-1,2-dihydropyrido[1,2-a]indole-3-carboxylates 以良好的收率。这些 oxepino [2,3-b] indolizines 和重排的 pyrido [1,2-a] indol-1(2H)-ones 的结构明显地通过物理和光谱手段,包括 X 射线分析确定。