Bioactive butenolides from Streptomyces antibioticus TÜ 99: absolute configurations and synthesis of analogs
作者:Gilles Grossmann、Marc Poncioni、Marc Bornand、Benoı̂t Jolivet、Markus Neuburger、Urs Séquin
DOI:10.1016/s0040-4020(03)00483-6
日期:2003.4
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.