Synthesis of the neocarzinostatin chromophore A core diynene structure using an η<sup>2</sup>-hexacarbonyidicobalt mediated Aldol reaction
作者:Philip Magnus、Thomas Pitterna
DOI:10.1039/c39910000541
日期:——
The monoketal of cyclopentene-1,3-dione was converted into the η2-Co2(CO)6 neocarzinostatincore 19 in six steps; oxidative decomplexation in the presence of cyclohexa-1,4-diene gave the cycloaromatized adduct 22.
Synthesis of the 4,5-epoxybicyclo[7.3.0]dodecadiyne neocarzinostatin core structure. Surprising compatibility of the 4,5-epoxide with a η<sup>2</sup>-hexacarbonyldicobalt mediated aldol reaction
作者:Philip Magnus、Martin Davies
DOI:10.1039/c39910001522
日期:——
The highly functionalized neocarzinostatin core structure 16 has been synthesized from the enynone 9 in a hexacarbonyldicobalt mediated aldol reaction in which the epoxide ring is unexpectedly not opened.
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.