diterpenoid (+)-jiadifenoic acid C starting from the available methyl ester of callitrisic acid (4-epidehydroabietic acid) isolated from sandarac resin is reported. A protocol for the isolation of methyl callitrisate (methyl 4-epidehydroabietate) in gram quantities from sandarac resin is also described. Allylic C-17 oxygenation was introduced by regioselective dehydrogenation of the isopropyl group of methyl
据报道,从
檀香树脂中分离出的可得的愈伤组织酸甲酯(4-表氢
松香酸),开始半合成抗病毒的
枞酸二
萜类化合物(+)-甲二烯酸C。还描述了一种从凉拌
树脂中分离出克量的Callitrisate甲酯(4-环
戊二酸甲酯)的方案。烯丙基C-17的氧合反应是通过用
DDQ对Callitrisate甲酯的异丙基进行区域选择性脱氢,然后进行
硒催化的烯丙基氧化来实现的。酯
水解从Callitrisate甲酯获得22%的总产率的(+)-jiadifenoic酸C。这种半合成途径为这种抗柯萨奇病毒B的
天然产物提供了方便的来源,可用于进一步的
生物学研究。