A rational strategy for accessing tetrahydroxy compounds in predictable stereoselective
fashion from di-O-benzyl protected tartrate is presented. Up to four different aromatic, aliphatic,
and vinyl substituents could be stepwise introduced at C1 and C4. This is exemplified
in an economic preparation of eight dihydroxy compounds from natural tartaric acid
in six steps and 19–59% overall yield. A final deprotection step afforded the corresponding
tetrahydroxy compounds in good yields.
Key words
regioselectivity - diastereoselectivity - diols - nucleophilic addition - Grignard
reaction