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.
中科院分区:
文献类型:
--
作者:
Outlaw, Victor K.;Townsend, Craig A.
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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影响因子:
1.8
作者:
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通讯作者:
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影响因子:
2.1
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