For the synthesis of demethyl analogues of Erythrophleum alkaloids, the tricyclic ketone 14 (trans-anti-trans) was prepared. The Horner reaction on 14 led to a mixture of cis/trans compounds, which could be separated into the homogeneous racemic isomers 21 and 22. These compounds were transformed into the corresponding 2-dimethylamino-ethyl esters of their 3-dehydro and 3-O-carbamoyl derivatives.
为了合成赤藓
生物碱的去甲基类似物,制备了
三环酮14(反式-反-反式)。14上的霍纳反应导致顺式/反式化合物的混合物,可以将其分离为均相的外消旋异构体21和22。这些化合物被转化为其3-脱氢和3-O-
氨基甲酰基衍
生物的相应的2-二甲基
氨基-乙基酯。