ASYMMETRIC-SYNTHESIS OF ALL STEREOISOMERS OF THE STRIGOL-ANALOG-GR24 - DEPENDENCE OF ABSOLUTE-CONFIGURATION ON STIMULATORY ACTIVITY OF STRIGA-HERMONTHICA AND OROBANCHE-CRENATA SEED-GERMINATION

All four optically pure stereoisomers of the strigol analogue GR24 wer e prepared via two different routes. In the first approach enantiopure ABC-fragments 4 were used as the chiral source, whereas in the altern ative route both antipodes of the latent D-ring 6 were employed. Bioas says revealed significant differences in activity between the four ste reoisomers in the stimulation of germination of the parasitic weeds St riga hermonthica and Orobanche crenata.