申请人:University of Vermont
公开号:US04283536A1
公开(公告)日:1981-08-11
This invention relates to the preparation of vincadifformine and related derivatives which are useful as starting material for the synthesis of among other alkaloids vincamine and other similar compounds possessing interesting psychopharmacologic properties. A tetrahydro-.beta.-carboline (II) is reacted with benzoyl chloride to provide a 2-benzoyl-1,2,3,4-tetrahydro-9H-pyrido-(3,4-b)-indole (III). Then compound (III) is reduced to give a 2-benzyl-1,2,3,4-tetrahydro-9H-pyrido-(3,4-b)-indole (IV). Thereafter, compound (IV) is transformed by t-butyl hypochlorite into a chloroindolenine derivative (V) which is immediately treated with a metal dialkylmalonate such as thallium t-butyl methyl malonate to give a dialkyl 3-benzyl-1,2,3,4,5,6-hexahydroazepino-(4,5-b)-indole-5,5-dicarboxylate (VI). Compound (VI) is then partly decarboxylated into a alkyl 3-benzyl-1,2,3,4,5,6-hexahydro-(4,5-b) indole-5-carboxylate (VII). Compound (VII) is hydrogenated to give an alkyl 1,2,3,4,5,6-hexahydroazepino-(4,5-b)-indole 5-carboxylate (VIII). In an alternative embodiment, compound (VI) can be hydrogenated to the corresponding dialkyl 1,2,3,4,5,6-hexahydroazepino-(4,5-b)-indole-5,5-dicarboxylate which is then decarboxylated into compound (VIII). Compound (VIII) is condensed with a functionalised aldehyde, typically a epoxy aldehyde or a haloaldehyde such as 1-bromo-4-formylhexane, to give vincadifformine or similar pentacyclic derivatives.
本发明涉及文卡地福明及其相关衍生物的制备,这些化合物可作为合成其他生物碱如文卡明等具有有趣的精神药理学特性的起始物质。首先将四氢-β-咔啉(II)与苯甲酰氯反应,得到2-苯甲酰基-1,2,3,4-四氢-9H-吡啶(3,4-b)-吲哚(III)。然后还原化合物(III)得到2-苄基-1,2,3,4-四氢-9H-吡啶(3,4-b)-吲哚(IV)。然后,将化合物(IV)转化为氯吲哚啉衍生物(V),并立即用金属二烷基丙二酸盐(如丁基甲基丙二酸铊)处理,得到双烷基-3-苄基-1,2,3,4,5,6-六氢氮杂环(4,5-b)-吲哚-5,5-二羧酸酯(VI)。化合物(VI)部分脱羧后得到烷基-3-苄基-1,2,3,4,5,6-六氢氮杂环(4,5-b)-吲哚-5-羧酸酯(VII)。化合物(VII)经过氢化后得到烷基-1,2,3,4,5,6-六氢氮杂环(4,5-b)-吲哚-5-羧酸酯(VIII)。在另一种实施方案中,化合物(VI)可以氢化为相应的双烷基-1,2,3,4,5,6-六氢氮杂环(4,5-b)-吲哚-5,5-二羧酸酯,然后脱羧为化合物(VIII)。化合物(VIII)与功能化醛(通常为环氧醛或卤代醛,如1-溴-4-甲酰己烷)缩合,得到文卡地福明或类似的五环衍生物。