Synthesis of Totarane Diterpenes: Totarol, Maytenoquinone, 6-Deoxymaytenoquinone and 8,11,13-Totaratriene-12,13-diol
作者:Masahiro Tada、Jun Kurabe、Hiroaki Yasue、Tomohisa Ikuta
DOI:10.1248/cpb.56.287
日期:——
The syntheses of four totarane diterpenes—totarol, 8,11,13-totaratriene-12,13-diol, 6-deoxymaytenoquinone and maytenoquinone—are described. Totarol was synthesized via cyclization of a modified polyene. 8,11,13-Totaratriene-12,13-diol was prepared from natural totarol by ortho-oxidation with mCBPO (m-chlorobenzoyl peroxide). Maytenoquinone and 6-deoxymaytenoquinone were synthesized from 8,11,13-totaratriene-12,13-diol. 1H-NMR analysis showed that tautomeric isomerization between 6-deoxymaytenoquinone (2-hydroxy-4-quinone methide) and the ortho-quinone was very slow.
合成了四种托塔烯二萜——托塔醇、8,11,13-托塔三烯-12,13-二醇、6-去氧美天醌和美天醌——的合成方法。托塔醇是通过改良的聚烯烃环化合成的。8,11,13-托塔三烯-12,13-二醇则是通过与mCBPO(对氯苯甲酰过氧化物)进行邻位氧化,从天然托塔醇制备而成。美天醌和6-去氧美天醌是由8,11,13-托塔三烯-12,13-二醇合成的。1H-NMR分析显示,6-去氧美天醌(2-羟基-4-醌亚甲基)与邻位醌之间的互变异构化非常缓慢。