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Beilstein J. Org. Chem. 2016, 12, 1870–1876, doi:10.3762/bjoc.12.176
Graphical Abstract
Figure 1: Structure of guanidines 1–10.
Scheme 1: Synthesis of guanidine 10. Conditions: (a) 1 equiv HOOC-CH2-COOH, 2 equiv NH4OAc, EtOH, 78 °C, 5 h,...
Figure 2: Crystal structure of guanidine 10 as a benzoate salt. Only one of the ion pairs is shown for the sa...
Scheme 2: Reaction of anthrones and N-arylmaleimides catalyzed by guanidine 10. The guanidine deprotonates an...
Figure 3: A) Chromatogram of rac-25 after incubation with 0.1 equiv of 10 in THF at −15 °C for 64 h. The fast...
Scheme 3: Assignment of the absolute configurations by chemical correlation. The R configuration of compound ...