Transformation of 2,3-dibenzylbutyrolactone lignans containing a secondary hydroxyl group to phenyltetralin lignans and their reduction products with lithium aluminum hydride.
作者:SANSEI NISHIBE、HIROKI TSUKAMOTO、SUEO HISADA、SAKAE YAMANOUCHI、MICHIO TAKIDO
DOI:10.1248/cpb.29.2082
日期:——
Two 2, 3-dibenzylbutyrolactone lignans containing a secondary hydroxyl group at one of the benzylic positions, 5-hydroxyarctigenin (I) and 5-hydroxytrachelogenin (XI), were transformed to phenyltetralin lignans, α-conidendrin monomethyl ether (II) and 3-hydroxy-α-conidendrin monomethyl ether (XII), respectively, by acid treatment. The hemiacetal lignan, (1S, 2R, 3S, 3aR) 6, 7-dimethoxy-3-hydroxy-2-hydroxymethyl-1-3', 4'-dimethoxyphenyl-1, 2, 3, 4-tetrahydronaphthalene-3-carboxylic acid lactol (XV), was obtained in addition to isoolivil dimethyl ether (XIV), the normal reduction product, when 3-hydroxy-α-conidendrin dimethyl ether (XIII) was treated with lithium aluminum hydride, and a mechanism is proposed for this reaction.
两种2,3-二苄基丁内酯木脂素(其中一种苄基位置含有次级羟基,即5-羟基白屈菜素(I)和5-羟基白屈菜素(XI))在酸处理后分别转化为苯基四氢萘木脂素、α-香树精单甲醚(II)和3-羟基-α-香树精单甲醚(XII)。当3-羟基-α-香树精二甲醚(XIII)与氢化铝锂反应时,除了得到异欧李维醇二甲醚(XIV)这一正常还原产物外,还得到了半缩醛木脂素(1S,2R,3S,3aR)6,7-二甲氧基-3-羟基-2-羟甲基-1-3',4'-二甲氧基苯基-1,2,3,4-四氢萘-3-羧酸内酯(XV),并提出了该反应的机理。