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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In this study we report on a flexible straight forward synthesis toward novel 3,5-diaryl-(1H)-pyrazin-2-ones. Our synthetic strategy involved an acyclic di-keto derivative as key intermediate. The final pyrazin-2-one ring closure reaction was yield-optimized by using a microwave mediated procedure and ammoniumacetate as nitrogen source. Our method is a suitable alternative to palladium-catalyzed coupling reactions for the 3,5-diaryl decoration of the (1H)-pyrazin-2-one scaffold. Since the (1H)-pyrazin-2-ones is present as scaffold in a number of biologically active compounds the reported synthetic platform is a useful approach to generate a set of highly diverse 3,5-diaryl-(1H)-pyrazin-2-one compounds. (C) 2013 Elsevier Ltd. All rights reserved.
Syntheses of Bis(3’-indolyl)-2(1H)-pyrazinones
作者:Biao Jiang、Xiao-Hui Gu
DOI:10.3987/com-00-8887
日期:——
The syntheses of 3,6-bis(3'-indolyl)-2(1H)-pyrazinone and 3,5-bis(3'-indolyl)-2( 1H)-pyrazinone were described. Syntheses of 3,6-bis(3 '-indolyl)2(1H)-pyrazinone proceeded through the condensation of N-Boc-indolylglycine with indol-3-yl-N-methyl-O-methoxyglycinamide, and followed by reduction with LiAlH4 and cyclization of the resulting bisindolyl aldehyde-amine. 3,5-Bis(3'-indolyl)-2(1H)-pyrazinone was synthesized by cyclization of bisindolyl ketone amine in excess of ammonia under pressure.
Synthesis of Marine Sponge Bisindole Alkaloids Dihydrohamacanthins
作者:Fumiko Y. Miyake、Kenichi Yakushijin、David A. Horne
DOI:10.1021/ol020002j
日期:2002.3.1
[structure: see text] A convergent synthesis of the marinesponge bisindole alkaloids dihydrohamacanthins is described. The synthesis centers on the construction of 3,5- and 3,6-linked pyrazinones and their reduction to the requisite piperazinones with sodium cyanoborohydride.