methyl 1a-ethyl-4-hydroxy-6-methoxy-5,10-dioxo-2,3,5,10-tetrahydrotetraceno[1,2-b]oxirene-11b(1aH)-carboxylate 在
Pd-BaSO
4 氢气 作用下,
以
乙醇 为溶剂,
以100%的产率得到c-2-Ethyl-1,2,3,4,6,11-hexahydro-t-2,5-dihydroxy-7-methoxy-6,11-dioxo-r-1-naphthacencarbonsaeure-methylester