首页> 外文期刊>Heterocycles: An International Journal for Reviews and Communications in Heterocyclic Chemistry >SYNTHESIS OF VINCA ALKALOIDS AND RELATED COMPOUNDS.PART 107.AN EFFICIENT CONVERGENT SYNTHETIC PATHWAY TO BUILD UP THE IBOPHYLLIDINE SKELETON III.TOTAL SYNTHESIS OF(+-)-IBOPHYLLIDINE AND(+-)-20-EPIIBOPHYLLIDINE
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SYNTHESIS OF VINCA ALKALOIDS AND RELATED COMPOUNDS.PART 107.AN EFFICIENT CONVERGENT SYNTHETIC PATHWAY TO BUILD UP THE IBOPHYLLIDINE SKELETON III.TOTAL SYNTHESIS OF(+-)-IBOPHYLLIDINE AND(+-)-20-EPIIBOPHYLLIDINE

机译:长春花碱及其相关化合物的合成。第107部分,建立IBOPHYLIDINE骨架的高效聚合合成途径III。总合成(+-)-IBOPHYLIDINE和(+-)-20-EPIIBOPHYLIDINE

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Starting from 5-ethyldihydrofuran-2(3/f)-one(9)we prepared aldehydes(6 and 7)which,in a[4+2]cycloaddition reactions with the tryptamine derivative(8)gave,as a final step,compounds(13 and 22)having D-seco-pseudoaspidospermane skeleton.We synthesized(+-)-20-epiibophyllidine(4)via the benzoate ester(15)or the mesylate(17)of alcohol(14)which had been obtained from 13,while the catalytic hydrogenation of 22 led to(+-)-ibophyllidine(3)via full epimerization,cyclization and reduction steps in one operation.
机译:从5-乙基二氢呋喃-2(3 / f)-one(9)开始,我们制备了醛(6和7),与色胺(8)进行[4 + 2]环加成反应,作为最后一步,具有D-seco-pseudoaspidospermane骨架的化合物(13和22)。我们从乙醇(14)的苯甲酸酯(15)或甲磺酸酯(17)合成了(+-)-20-epiibophyllidine(4) 13,而22的催化加氢通过完全差向异构化,环化和还原步骤在一次操作中生成(+-)-ibophyllidine(3)。

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