CARBENE LIGANDS AS ANTHRACYCLINONESYNTHONS-II CHROMIUM MEDIATED CYCLOADDITION OF ALKYNES, CARBENES AND CARBON MONOXIDE: APPLICATION TO RING B SYNTHESIS IN ANTHRACYCLINONES

Article abstract of DOI:10.1016/S0040-4020(01)91419-X

The cycloaddition of Cr-co-ordinated alkyne, carbene and carbonyl ligands provides a variable route to the anthracyclinone skeleton.The key step of a formal total synthesis of 4-demethoxydaunomycinone (1) is based on the reaction of carbonyl-carbene complex 15 -used as a CD ring synthon- and alkyne 9 leading to the formation of ring B.