Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A concise synthesis of the antibiotic coumermycin A 1 , a natural product isolated from streptomyces, was achieved. In a key step, a selectively protected noviose sugar was prepared from novobiocin through a transglycosylation reaction with acetone. ... A concise synthesis of ...