The stereoselective synthesis of the 1-0-aD -glucopyranosides and 1-0-aD -cellobiosides of 3deoxy-2(7?)-and 2(S)-glycerols to determine the complete stereochemistry of rhynchosporoside, which is a host selective phytotoxin from Rhynchosporium secalis, is described in detail. Rhynchosporiumsecalis is the causal microorganism for scald disease in barley and other grasses.2) A phytotoxic compound, named rhynchosporoside, was isolated by Auriol et al.3) in 1978, and it was proposed that its
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