Suppose I had a monosaccharide, e.g. D-arabinose. Suppose I do a few synthetic steps with it, and end up with the compound methyl (2S,3R,4R)-3,5-dihydroxy-2,4-dimethoxypentanoate. (as labelled by ChemDraw. If that is not the PIN, please correct.)
However, when writing my paper/thesis/lab report, I would love to derive the base name from D-arabinose for simplicity and consistency. The monosaccharide derivatives with a carboxylic acid in place of an aldehyde are -onic acids so my base name would be methyl D-arabinonate. But how would I correctly and unambiguously label the methoxy groups?
If I used 2,4-dimethyl, that would sound like this second compound:
And if I used 2,4-dimethoxy, wouldn’t that make it this one:
Is there a trick I am missing for clearly naming the compound as above with methyl D-arabinonate as a base name?