With a view to establishing the structure of the Alangium alkaloid desmethylpsychotrine, (+)-9-demethylpsychotrine [(+)-1] has been synthesized from ethyl cincholoiponate [(+)-6] and 3-benzyloxy-4-methoxyphenacyl bromide by the "cincholoipon-incorporating method" through the intermediates (+)-7, 8, 10-(+)-14, and (+)-17-(+)-22. The identity of synthetic (+)-1 with natural desmethylpsychotrine unequivocally established the structure of this alkaloid.
为了确定Alangium
生物碱desmethylpsychotrine的结构,我们采用 "cincholoipon-incorporating法",通过中间产物(+)-7、8、10-(+)-14和(+)-17-(+)-22,从cincholoipon酸
乙酯[(+)-6]和3-苄
氧基-4-
甲氧基苯乙酰溴合成了(+)-9-demethylpsychotrine[(+)-1]。合成物 (+)-1 与
天然去
甲基苦参碱的同一性明确地确定了这种
生物碱的结构。