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Synthesis, structural characterization, and biological evaluation of all four enantiomers of strigol analog GR7

All four optically pure enantiomers of strigol analogue GR7 were prepared by starting from commercially available, pure enantiomers of «Corey's lactone». The separation of the diastereomers in the crude products was readily accomplished by column chromatography on silica. The absolute configuration of the four enantiomers was determined from X-ray analysis in combination with R f values of the products and the configuration of the starting lactones. Biological evaluation revealed significant differences between the four enantiomers in stimulation of germination of parasitic weed seeds