Bioactive butenolides from Streptomyces antibioticus TÜ 99: absolute configurations and synthesis of analogs
摘要:
The four furanones (butenolides) 1-4, which had been isolated from the fermentation broth of Streptomyces antibioticus TU 99 and in preliminary tests had been shown to be biologically active, were synthesized by reaction of the readily available furanones 9 or 16 with 2-methylpropanal or 2-methylbutanal. In addition, a series of analogs was prepared in a similar way from 16 using different aldehydes. The hitherto unknown absolute configurations of the natural products 1-4 as well as those of all the analogs prepared were determined with Mosher's NMR method and/or X-ray crystallography. Some of the compounds synthesized proved to be active in the quorum sensing system of Chromobacterium violaceum. (C) 2003 Elsevier Science Ltd. All rights reserved.
Bioactive butenolides from Streptomyces antibioticus TÜ 99: absolute configurations and synthesis of analogs
摘要:
The four furanones (butenolides) 1-4, which had been isolated from the fermentation broth of Streptomyces antibioticus TU 99 and in preliminary tests had been shown to be biologically active, were synthesized by reaction of the readily available furanones 9 or 16 with 2-methylpropanal or 2-methylbutanal. In addition, a series of analogs was prepared in a similar way from 16 using different aldehydes. The hitherto unknown absolute configurations of the natural products 1-4 as well as those of all the analogs prepared were determined with Mosher's NMR method and/or X-ray crystallography. Some of the compounds synthesized proved to be active in the quorum sensing system of Chromobacterium violaceum. (C) 2003 Elsevier Science Ltd. All rights reserved.
A Diels-Alder/Retro-Diels-Alder Approach for the Enantioselective Synthesis of Microbial Butenolides
作者:Christian A. Citron、Susanne M. Wickel、Barbara Schulz、Siegfried Draeger、Jeroen S. Dickschat
DOI:10.1002/ejoc.201200991
日期:2012.10.9
structures were verified by synthesis of reference compounds through a Diels–Alder/retro-Diels–Alder approach. This synthetic method was also successfully applied in the synthesis of butenolides that are signalling molecules from streptomycetes. For the enantioselective synthesis of these butenolides a modified route including an enantioselective Diels–Alder reaction was used.
The four furanones (butenolides) 1-4, which had been isolated from the fermentation broth of Streptomyces antibioticus TU 99 and in preliminary tests had been shown to be biologically active, were synthesized by reaction of the readily available furanones 9 or 16 with 2-methylpropanal or 2-methylbutanal. In addition, a series of analogs was prepared in a similar way from 16 using different aldehydes. The hitherto unknown absolute configurations of the natural products 1-4 as well as those of all the analogs prepared were determined with Mosher's NMR method and/or X-ray crystallography. Some of the compounds synthesized proved to be active in the quorum sensing system of Chromobacterium violaceum. (C) 2003 Elsevier Science Ltd. All rights reserved.