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Beilstein J. Org. Chem. 2016, 12, 2240–2249, doi:10.3762/bjoc.12.216
Graphical Abstract
Figure 1: Bioactive 2,3’-spiropyrrolidinyloxindoles.
Scheme 1: Earlier studied cycloaddition reaction.
Scheme 2: Synthesis of dipolarophiles 1a–c.
Scheme 3: Synthesis of dispirocompounds 4a–o.
Figure 2: Synthesis of dispiro compounds 4a–o. Reaction conditions: heating the mixture of compounds 1 (0.5 m...
Scheme 4: Synthesis of dipolarophiles 1d–f.
Figure 3: Synthesis of dispiro compounds 4p–t. Reaction conditions: heating the solution of compounds 1 (0.5 ...
Figure 4: Key interactions in {1H-13C}HMBC spectrum of 4f.
Figure 5: General view of 4c in the crystal in thermal ellipsoids representation (50% probability). Hydrogen ...
Figure 6: General view of 4e in the crystal in thermal ellipsoids representation (40% probability). Hydrogen ...
Figure 7: General view of 4r in the crystal in thermal ellipsoids representation (50% probability). Hydrogen ...
Figure 8: Modes of approach of azomethine ylide (R = H, Ph).