3-(Benzenesulfonyl)-7-methoxy-2-benzofuran-1(3H)-one → HCID 20266223, compound

Participants

Reaction Steps

Continuing with a synthesis utilizing the object compound (5) to produce the tetrahydronaphthacene dione intermediate, the anion of 7-methoxy-3-phenylsulfonyl-1(3H)-isobenzofuranone (6) as generated at -78° C. using lithium t-butoxide in THF and reacted with the hexahydronaphthalenone (5) to furnish 9-acetyl-5,12-dihydroxy-4-methoxy-6(11H)-hexahydronaphthacenone (7) in 95% yield. Conversion of (7) to 9-acetyl-6-hydroxy-4-methoxy-7,8,9,10-tetrahydronaphthacene-5,12-dione (8) was achieved by heating (7) in dimethylforamide under oxygen at 45° C. for 18 hours.

Provenance & Evidence