Autoxidation of 4-amorphen-11-ol and the biogenesis of nor- and seco-amorphane sesquiterpenes from fabiana imbricata
作者:Koon-Sin Ngo、Geoffrey D. Brown
DOI:10.1016/s0040-4020(99)00986-2
日期:1999.12
Photooxidation of 4-amorphen-11-ol (1), recently reported as one of the major sesquiterpene natural products from the medicinal plant Fabiana imbricata, results in three allylic hydroperoxides 6, 9 and 10, which are expected from the “ene-type” reaction of molecular oxygen with the tri-substituted double bond in 1. The tertiary allylic hydroperoxide 6 undergoes carbon-carbon bond cleavage and a second
的光氧化4- amorphen -11-醇(1),最近报道从药用植物的主要倍半萜烯天然产物之一法比亚纳玳瑁,结果在三个烯丙基氢过氧化物6,9和10,这是从“烯型预期在三取代的双键”分子氧的反应1。叔烯丙基氢过氧化物6所经受碳-碳键裂解和第二自氧化反应,得到更高度氧化开环-amorphane 11非常温和的条件下。然后在酸中,该化合物可能会经历第二个碳-碳键裂解反应,从而产生也不-sesquiterpenes 2和3(报告为真正从天然产物F.玳瑁,或环化倍半萜烯peroxofabianane(5),这是一种推测的前体的天然产物fabianane(4)。关于两个化学过程的一些机械的调查:即: -碳-碳键裂解和自氧化这将解释天然产物的形成2,3和4从1报告第三烯丙基氢过氧化物。32,它缺乏11-羟基官能团存在于1在更强的条件下仅经历C-4 / C-5碳-碳键裂解,表明该官能团在协助4-amorp