The reaction of D-(–)-pantolactone with ammonia leads to the formation of D-pantoamide, which reacts with Ас2О and HClO4 to give 5-[2-(acetoxy)-1,1-dimethylethyl]-2-methyl-4-oxo-4,5-dihydro-1,3-oxazolium perchlorate. The obtained 2-methyl-1,3-oxazolium perchlorate readily reacts with aromatic aldehydes to afford 2-(2-arylvinyl)-1,3-oxazolium perchlorates. The plant protecting properties of the obtained compounds were studied. We found that 2-(2-arylvinyl)-4-oxo-4,5-dihydro-1,3-oxazolium perchlorates are effective as antidotes towards herbicide 2,4-D but have no plant growth activity.
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A new synthesis of 4-oxo-4,5-dihydro-1,3-oxazolium perchlorates from D-pantoamide
Published: 08 November 2016 by MDPI in The 20th International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis