Intramolecular Hetero Diels-Alder with Inverse Electron Demand: Synthesis of Pyrano[3,2-<i>b</i>]indole Derivatives
作者:Yann Davion、Benoît Joseph、Jean-Yves Mérour
DOI:10.1055/s-1998-1855
日期:1998.10
Pyrano[3,2-b]indole derivatives 4, 5 and 8 have been synthesised in good yields from 1-acetyl-2-benzylidene-1H-indol-3(2H)-one 3 and 7 via an intramolecular Hetero Diels-Alder reaction with inverse electron demand.
Pyrano[3,2-b]indolederivatives 2–6 were synthesized in good yields from 1-acetyl-2-benzylidene-2,3-dihydro-1H-indol-3-ones 8 and 13–15 by an intramolecular hetero-DielsAlder reaction. The structures of compounds 2a, 3a, 4, 5, and 6 were unambiguously established by X-ray analysis. Compounds 4 and 5 were further aromatized to the corresponding derivatives 16 and 17, respectively.
吡喃并[3,2- b ]吲哚衍生物2 - 6中以良好的收率合成由1-乙酰基-2-苄基-2,3-二氢-1- ħ -吲哚-3-酮8和13 - 15通过分子内的杂- DielsAlder反应。通过X射线分析明确地确定了化合物2a,3a,4、5和6的结构。将化合物4和5分别进一步芳香化为相应的衍生物16和17。