Methods for making bis-heterocyclic compounds, especially bis-heterocyclic compounds having five and six-membered heterocyclic linkers are described. Also described are methods for making an alpha amino ketone synthon that enables facile syntheses of bisindole compounds, including topsentins and dragmacidins.
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A Facile Synthesis of Dragmacidin B and 2,5-Bis(6‘-bromo-3‘-indolyl)piperazine
作者:Fumiko Y. Miyake、Kenichi Yakushijin、David A. Horne
DOI:10.1021/ol0001970
日期:2000.10.1
A short synthesis of dragmacidin B (1), 2,5-bis(6'-bromo-3'-indolyl)piperazine (2), and corresponding didebromo analogues 8 and 9 is described. The key steps involve the dimerization of oxotryptamines 4 and 11 to give bis(indolyl)pyrazines 5 and 12, which upon selective reduction and reductive methylation with sodium cyanoborohydride afforded the requisite piperazine natural products.
Reduction of 2,5-Bis(3′-indolyl)pyrazines to 2,5-Bis(3′-indolyl)piperazines: Synthesis of Bisindolylpiperazine Marine Alkaloids Dragmacidin A, B, and C
作者:David A. Horne、Fay Tonsiengsom、Fumiko Y. Miyake、Kenichi Yakushijin
DOI:10.1055/s-2005-918431
日期:——
A concise totalsynthesis of the bisindole alkaloids dragmacidin A, B and C is described that centers on the preparation and reduction of 2,5-bis(3'-indolyl)pyrazines to 2,5-bis(3'-indolyl)piperazines.