2,2,5-Trimethyl-1,3-dioxolane-4-carboxaldehyde as a chiral synthon: synthesis of the two enantiomers of methyl 2,3,6-trideoxy-.alpha.-L-threo-hex-2-enopyranoside, key intermediate in the synthesis of daunosamine, and of (+)- and (-)-rhodinose
2,2,5-Trimethyl-1,3-dioxolane-4-carboxaldehyde as a chiral synthon: synthesis of the two enantiomers of methyl 2,3,6-trideoxy-.alpha.-L-threo-hex-2-enopyranoside, key intermediate in the synthesis of daunosamine, and of (+)- and (-)-rhodinose