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Beilstein J. Org. Chem. 2019, 15, 2948–2957, doi:10.3762/bjoc.15.290
Graphical Abstract
Scheme 1: Ireland–Claisen rearrangement of allyl esters 1a–c.
Scheme 2: Ireland–Claisen rearrangement of 1c mediated by tertiary amines.
Figure 1: Organocatalysts used in this study. Conditions: typical procedure: 1. Et3N (4.9 equiv), DCM, −60 °C...
Scheme 3: Solvent-free Ireland–Claisen rearrangement of cinnamyl esters.
Figure 2: ωB97X-D/6-31G* calculated uncatalyzed Ireland–Claisen rearrangement of 1c. Charges on allylic oxyge...
Figure 3: ωB97X-D/6-31G* calculated Schreiner thiourea (12)-catalyzed Ireland–Claisen rearrangement of 1c. Ch...
Figure 4: ωB97X-D/6-31G* calculated Ph-thiourea (top) and squaramide-catalyzed (bottom) Ireland–Claisen rearr...
Figure 5: a) Rate of product formation; b) reaction profile without catalyst determined by 1H NMR.