已经研究了通过酰基四羧酸与羧酸的O-酰化然后酰基转移来合成3-酰基四酸(生物活性天然产物的子结构)的方法。该酰化序列由N,N′-二环己基碳二亚胺(DCC)和4-二甲基氨基吡啶(DMAP)介导,并且对氮取代基(R 1)的性质,羧酸(R 2 CO 2 H )的性质非常敏感。),以及DMAP的数量。N-酰化由于过量的DMAP引起的酰基迁移,使用1.3当量的DMAP(含1.1当量的DCC)将酰基四酸与烷基羧酸意外地直接生成了3-酰基四酸。另一方面,通过仅使用0.1当量的DMAP(具有1.1当量的DCC),将N-未取代的,N-烷基和N-酰基的四甲酸与烷基和芳族羧酸一起给出O-酰基的四甲酸。这些可以通过用过量的DMAP处理而进一步重排成酰基产物。发现这些3-酰基四酸在溶液中的互变异构平衡在很大程度上取决于氮取代基(R 1)而不是3-酰基。
A Detailed Study of Antibacterial 3-Acyltetramic Acids and 3-Acylpiperidine-2,4-diones
作者:Yong-Chul Jeong、Zsolt Bikadi、Eszter Hazai、Mark G. Moloney
DOI:10.1002/cmdc.201402093
日期:2014.5.18
Inspired by the core fragment of antibacterial natural products such as streptolydigin, 3‐acyltetramic acids and 3‐acylpiperidine‐2,4‐diones have been synthesised from the core heterocycle by direct acylation with the substituted carboxylic acids using a strategy which permits ready access to a structurally diverse compound library. The antibacterial activity of these systems has been established against
Synthesis of and Tautomerism in 3-Acyltetramic Acids
作者:Yong-Chul Jeong、Mark G. Moloney
DOI:10.1021/jo102304y
日期:2011.3.4
carboxylic acid (R2CO2H), and the amount of DMAP. Acylation of N-acyl tetramicacids with an alkyl carboxylic acid using 1.3 equiv of DMAP (with 1.1 equiv of DCC) unexpectedly gave the 3-acyltetramicacid directly as a result of acyl migration induced by excess amounts of DMAP. On the other hand, N-unsubstituted, N-alkyl, and N-acyl tetramicacids with alkyl and aromatic carboxylic acids gave the O-acyl tetramic
已经研究了通过酰基四羧酸与羧酸的O-酰化然后酰基转移来合成3-酰基四酸(生物活性天然产物的子结构)的方法。该酰化序列由N,N′-二环己基碳二亚胺(DCC)和4-二甲基氨基吡啶(DMAP)介导,并且对氮取代基(R 1)的性质,羧酸(R 2 CO 2 H )的性质非常敏感。),以及DMAP的数量。N-酰化由于过量的DMAP引起的酰基迁移,使用1.3当量的DMAP(含1.1当量的DCC)将酰基四酸与烷基羧酸意外地直接生成了3-酰基四酸。另一方面,通过仅使用0.1当量的DMAP(具有1.1当量的DCC),将N-未取代的,N-烷基和N-酰基的四甲酸与烷基和芳族羧酸一起给出O-酰基的四甲酸。这些可以通过用过量的DMAP处理而进一步重排成酰基产物。发现这些3-酰基四酸在溶液中的互变异构平衡在很大程度上取决于氮取代基(R 1)而不是3-酰基。
Tetramic Acids as Scaffolds: Synthesis, Tautomeric and Antibacterial Behaviour
作者:Mark Moloney、Yong-Chul Jeong
DOI:10.1055/s-0029-1217745
日期:2009.9
Efficient synthetic routes for tetramic acids variously substituted on the ring nitrogen, their tautomeric behaviour in solution and their antibiotic activity are reported.