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Beilstein J. Org. Chem. 2014, 10, 692–700, doi:10.3762/bjoc.10.62
Graphical Abstract
Scheme 1: Preparation of maleimide dipolarophiles 4a–c.
Scheme 2: Preparation of 1,3-dipole precursors 9a–d.
Figure 1: Bi-/tridentate ligands used for the optimization of the reaction conditions.
Figure 2: ORTEP diagram showing the molecular structure of 10a at 30% probability level.
Scheme 3: Plausible mechanistic pathway for the synthesis of pyrrolo[3′,4′:3,4]pyrrolo[1,2-a]furoquinolines.
Scheme 4: Synthesis of pyrrolo[3′,4′:3,4]pyrrolo[1,2-a]furoquinoline analogues under the optimized protocol.
Scheme 5: Construction of pyrrolo[3′,4′:3,4]pyrrolo[1,2-a]phenanthrolines 14a–c and of pyrrolo[1,2-a]phenanth...
Figure 3: ORTEP diagram showing the molecular structure of 14e at 30% probability level.