methyl (6a-SR,9-RS,10-SR,10a-RS)-9-ethyl-12-t-butyldimethylsilyloxy-5,9-dihydroxy-4-methoxy-6-oxo-6,6a,7,8,9,10,10a,11-octahydronaphthacene-10-carboxylate 在
ammonium cerium(IV) nitrate 作用下,
以55%的产率得到methyl (6a-SR,9-RS,10-RS,10a-RS)-9-ethyl-9-hydroxy-4-methoxy-5,6,12-trioxo-5,6,6a,7,8,9,10,10a,11,12-decahydronaphthacene-10-carboxylate