报道了四种螺环羟吲哚生物碱的外消旋全合成。一般的起始材料是 N-2-丁烯基化的 2-羟色胺,它与官能化的醛进行碱介导的曼尼希螺环化反应以生成 C 环。第二个关键步骤是 Pd 催化的 α-酮酯烯醇化物(在原始醛中)环化到烯丙基碳酸酯(在 N 取代基中)以形成 D 环。关键步骤的立体选择性适中,但异构体易于纯化,可以方便地制备天然产物,其中三个是首次。
Indole derivatives and therapeutically acting drugs
申请人:Omnium Chimique Societe Anonyme
公开号:US04200638A1
公开(公告)日:1980-04-29
The invention relates to new indole derivatives, their preparation and use as drugs. Said compounds may be represented by the general formula ##STR1## in which R represents a hydrogen atom or an alkyl or benzyl group and Z represents a hydrogen atom or a halogen atom or an alkyl, hydroxy, acyloxy, carbamate or methoxy group. They are prepared by reacting tryptamine derivatives with synthons of the formula ##STR2## in which X and Y each represent an oxygen or sulphur atom, and R.sub.1 and R.sub.2 each represent an alkyl or phenyl radical or form together an alkylidene chain. They may be used as intermediate compounds for chemical syntheses and also as drug for treating cerebro-vascular and cardio-circulatory insufficiencies.
Total Synthesis of the Spirocyclic Oxindole Alkaloids Corynoxine, Corynoxine B, Corynoxeine, and Rhynchophylline
作者:Martin J. Wanner、Steen Ingemann、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/ejoc.201201505
日期:2013.2
Racemic total syntheses of four spirocyclicoxindolealkaloids are reported. The general starting material was an N-2-butenylated 2-hydroxytryptamine, which underwent a base-mediated Mannich spirocyclisation with a functionalised aldehyde to generate the C-ring. The second key step was a Pd-catalysed cyclisation of an alpha-keto ester enolate (in the original aldehyde) onto an allylic carbonate (in
报道了四种螺环羟吲哚生物碱的外消旋全合成。一般的起始材料是 N-2-丁烯基化的 2-羟色胺,它与官能化的醛进行碱介导的曼尼希螺环化反应以生成 C 环。第二个关键步骤是 Pd 催化的 α-酮酯烯醇化物(在原始醛中)环化到烯丙基碳酸酯(在 N 取代基中)以形成 D 环。关键步骤的立体选择性适中,但异构体易于纯化,可以方便地制备天然产物,其中三个是首次。
Collective Total Synthesis of Mavacuran Alkaloids through Intermolecular 1,4‐Addition of an Organolithium Reagent.
作者:Audrey Mauger、Maxime Jarret、Aurélien Tap、Rémi Perrin、Régis Guillot、Cyrille Kouklovsky、Vincent Gandon、Guillaume Vincent
DOI:10.1002/anie.202302461
日期:——
Intermolecular 1,4-addition of a functionalized vinyl lithium reagent to a readily accessible Michael acceptor enabled the synthesis of six mavacuran alkaloids with a highly strained pentacyclic cagelike framework. The chemo- and diastereoselectivity of the reaction were rationalized by DFT calculations. Dihydroxylation and pinacol rearrangement of the indole nucleus completed the first total syntheses