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Beilstein J. Org. Chem. 2014, 10, 2421–2427, doi:10.3762/bjoc.10.252
Graphical Abstract
Figure 1: Proposed structure of astakolactin (1).
Scheme 1: Retrosynthetic analysis.
Scheme 2: Synthesis of 2,3-cis-astakolactin.
Scheme 3: MNBA-mediated lactonization.
Scheme 4: Synthesis of 2,3-trans-astakolactin.
Figure 2: Δδ (ppm) of 1H NMR chemical shifts in 1. Δδ corresponds to the difference in chemical shift for nat...
Figure 3: Δδ (ppm) of 1H NMR chemical shifts in 1’. Δδ corresponds to the difference in chemical shift for na...