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Herein, we describe the enantioselective construction of the 12‐membered macrocyclic pyrrole core of marineosin A in 5.1 % overall yield from (S)‐propylene oxide. The route features a key Stetter reaction to install a 1,4‐diketone, which is subjected to Paal–Knorr pyrrole synthesis and ring‐closing metathesis to afford the macrocycle. A divergence point in the synthetic scheme also enabled access...
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