Syntheses of Several Cyclopentano-Monoterpene Lactones Using 1,3-Dioxin Vinylogous Ester.
作者:Masashi OHBA、Tsuyoshi HANEISHI、Tozo FUJII
DOI:10.1248/cpb.43.26
日期:——
Formal syntheses of (±)-boschnialactone (5) and three cyclopentano-monoterpene lactones [i.e., (±)-iridomyrmecin (6), (±)-isoiridomyrmecin (7), and (±)-allodolicholactone (8)] have been accomplished in the form of the syntheses of 2-(methoxymethyl)-3-methyl-2-cyclopenten-1-one (11) and (±)-(4aα, 7α, 7aα)-hexahydro-7-methylcyclopenta[c]pyran-3(1H)-one (19), respectively, starting from 6, 7-dihydrocyclopenta-1, 3-dioxin-5(4H)-one (2). A synthesis of (±)-isodehydroiridomyrmecin (9) has also been achieved through a route including direct substitution of the hydroxy group of 2-(tert-butyldimethylsilyloxymethyl)-3-methyl-2-cyclopenten-1-ol (22) with 1-(tert-butyldimethylsilyloxy)-1-methoxyethene (23) as a key step.
已成功合成(±)-博希尼内酯(5)及三种环戊烯-单萜内酯,即(±)-蚁酸酯(6)、(±)-异蚁酸酯(7)和(±)-全罗松内酯(8),其合成过程分别利用了2-(甲氧基甲基)-3-甲基-2-环戊烯-1-酮(11)和(±)-(4aα, 7α, 7aα)-六氢-7-甲基环戊[c]吡喃-3(1H)-酮(19),起始材料为6, 7-二氢环戊-1, 3-二氧-5(4H)-酮(2)。同时,(±)-异脱氢蚁酸酯(9)的合成也已实现,合成路线的关键步骤为直接用1-(叔丁基二甲基氯硅氧基)-1-甲氧基乙烯(23)取代2-(叔丁基二甲基硅氧基甲基)-3-甲基-2-环戊烯-1-醇(22)中的羟基。