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Summary of Schreiber’s pairwise use of Ferrier and Pauson–Khand reactions for the synthesis of polycyclic skeletons. Reagents and conditions: (1) cat. BF3·OEt2, CH2Cl2, −78 to −20 °C, 92%; (2) TBAF, AcOH, THF; purification, 72%; (3) Co2(CO)8, CH2Cl2; NMO, CH2Cl2-CH3CN.
