5, 8, 11, 13-Abietatetraen-3-one (3) and its 12-methoxy derivative (7) were oxidized to the corresponding 3, 7-diones, which were rearranged respectively into 2-isopropyl-6-methyl-5-(4-methyl-3-oxopentyl)naphthalene (6) and its 12-methoxy derivative (10) by sodium borohydride reduction and subsequent dehydration with boron trifluoride etherate. Compound 10 was further converted into 3-oxosapriparaquinone (1) via 5-(3-acetoxy-4-methylpentyl)-2-isopropyl-6-methyl-3, 4-naphthoquinone (14).
5,8,11,13-联四烯-3-酮(3)及其 12-甲氧基衍
生物(7)被氧化成相应的 3,7-二酮,通过
硼氢化钠还原和随后的
三氟化硼醚脱
水,分别重排为 2-异丙基-6-甲基-5-(4-甲基-3-氧代戊基)
萘(6)及其 12-甲氧基衍
生物(10)。化合物 10 通过 5-(3-乙酰氧基-4-甲基戊基)-2-异丙基-6-甲基-3, 4-
萘醌 (14) 进一步转化为 3-氧代
四氢呋喃萘醌 (1)。