Synthesis of the 4,5-epoxybicyclo[7.3.0]dodecadiyne neocarzinostatin core structure. Surprising compatibility of the 4,5-epoxide with a η2-hexacarbonyldicobalt mediated aldol reaction
Synthesis of the 4,5-epoxybicyclo[7.3.0]dodecadiyne neocarzinostatin core structure. Surprising compatibility of the 4,5-epoxide with a η2-hexacarbonyldicobalt mediated aldol reaction
The bicyclo[7.3.0]dodecadiyne core structure of the antitumor agents neocarzinostatin, kedarcidin, C-1027 and maduropeptin can be readily constructed by an intramolecular aldol reaction to form the bond only if the C-6,7 triple bond is complexed as its η2Co2(CO)6-acetylene adduct.