A practical route to substituted 7-aminoindoles from pyrrole-3-carboxaldehydes.

A practical route to substituted 7-aminoindoles from pyrrole-3-carboxaldehydes.
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DOI:
10.1021/ol503078h
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发表时间:
2014-12-19
期刊:
影响因子:
5.2
通讯作者:
Townsend, Craig A.
Townsend, Craig A.
中科院分区:
化学1区
文献类型:
--
作者:
Outlaw, Victor K.;Townsend, Craig A.

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吲哚类化合物在药物化学和生物碱研究中占有重要地位。在这里,我们报告了一个灵活和有效的转化吡咯-3-甲醛取代7-氨基-5-氰基吲哚。膦加成到乙腈的过程中,最初形成的两性膦会发生质子转移重排,生成亲电子的膦叶立德,这将用于原位Wittig烯烃化。在BF 3·OEt 2存在下,主要的E-烯烃产物定位烯丙基腈以进行容易的分子内Hoeben-Hoesch反应。说明了2,5-和3,5-二取代的7-氨基吲哚的合成。此外,烯丙基腈的二阴离子烷基化被证明在环化后提供5,6-二取代的7-氨基吲哚,以进一步证明这种可规模化和高产率的方法。
Among privileged structures, indoles occupy a central place in medicinal chemistry and alkaloid research. Here we report a flexible and efficient conversion of pyrrole-3-carboxaldehydes to substituted 7-amino-5-cyanoindoles. Phosphine addition to fumaronitrile proceeds with prototropic rearrangement of the initially formed zwitterion to the thermodynamically favored phosphonium ylide, which is poised for in situ Wittig olefination. The predominantly E-alkene product positions the allylic nitrile for facile intramolecular Hoeben–Hoesch reaction in the presence of BF3·OEt2. Syntheses of 2,5- and 3,5-disubstituted 7-aminoindoles are illustrated. Additionally, dianion alkylation of the allylic nitrile is demonstrated to furnish, after cyclization, 5,6-disubstituted 7-aminoindoles to further exemplify this scalable and high-yielding method.
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