The monoketal of cyclopentene-1,3-dione was converted into the η2-Co2(CO)6 neocarzinostatin core 19 in six steps; oxidative decomplexation in the presence of cyclohexa-1,4-diene gave the cycloaromatized adduct 22.
P. Magnus and T. Pitterna, J. Chem. Soc., Chem. Commun., 1991, 541 DOI: 10.1039/C39910000541
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