Oxidation of (R)-3-(3-acetoxypropyl)-2,3-dihydro-6-hydroxy-7-isopropyl-3,4-dimethylnaphtho[2,3-b]furan-2-one with Fremy’s radical afforded the corresponding o-quinone, which was converted into (R)-5,6,8-triacetoxy-3-(3-acetoxypropyl)-2,3-dihydro-7-isopropyl-3,4-dimethylnaphtho[2,3-b]furan-2-one and its 5,6,9-triacetoxy isomer. (R)-3-(3-Acetoxypropyl)-2,3-dihydro-7-isopropyl-3,4-dimethylnaphtho[2,3-b]furan-2-one was also converted into (R)-9-acetoxy- and (R)-5,8,9-triacetoxy-2,3-dihydro-7-isopropyl-3-(3-methoxypropyl)-3,4-dimethylnaphtho[2,3-b]-furan-2-one. Transformation of (R)-2,3-dihydro-6-hydroxy-3-(3-hydroxypropyl)-7-isopropyl-3,4-dimethylnaphtho-[2,3-b]furan-2-one into (R)-6-acetoxy-3-allyl-2,3-dihydro-7-isopropyl-3,4-dimethylnaphtho[2,3-b]furan-2-one was also achieved.
(R)-3-(3-乙酰氧丙基)-2,3-二氢-6-羟基-7-异丙基-3,4-
二甲基萘[2,3-b]
呋喃-2-酮与Fremy自由基的氧化反应生成了相应的邻醌,随后转化为(R)-5,6,8-三乙酰氧基-3-(3-乙酰氧丙基)-2,3-二氢-7-异丙基-3,4-
二甲基萘[2,3-b]
呋喃-2-酮及其5,6,9-三乙酰氧基异构体。同时,(R)-3-(3-乙酰氧丙基)-2,3-二氢-7-异丙基-3,4-
二甲基萘[2,3-b]
呋喃-2-酮也被转化为(R)-9-乙酰氧基和(R)-5,8,9-三乙酰氧基-2,3-二氢-7-异丙基-3-(
3-甲氧基丙基)-3,4-
二甲基萘[2,3-b]
呋喃-2-酮。此外,(R)-2,3-二氢-6-羟基-3-(3-羟基丙基)-7-异丙基-3,4-
二甲基萘[2,3-b]
呋喃-2-酮也成功转化为(R)-6-乙酰氧基-3-烯丙基-2,3-二氢-7-异丙基-3,4-
二甲基萘[2,3-b]
呋喃-2-酮。