Synthesis of highly functionalized 9,10-anthraquinones

摘要

The reaction of dialkyl acetylenedicarboxylates with ethyl 9,10-dihydro-2-methyl-9,10-dioxo-anthracen-l-yl-carbamoyl-formate in the presence of triphenylphosphine produces dialkyl 2,5-dihydro-l-(9,10-dihydro-2-methyl-9;10-dioxoanthracen-l-yl)-4-ethoxy-5-oxo-lH-pyrrole-2,3-dicarboxylates in fairly good yields.