Methyl 5-deoxy-2,3-O-isopropylidene-D-ribofuranoside is a protected ribofuranoside derivative. Its structure features a methyl glycoside at the anomeric carbon and an isopropylidene acetal protecting group at the 2,3-positions, while the 5-position is deoxygenated. This specific protection pattern makes it a valuable chiral synthon. This compound is primarily used as a key intermediate in the synthesis of nucleoside analogues and modified sugars. The isopropylidene group protects the cis-diol, allowing for selective functionalization at other positions. It serves as a crucial building block for the preparation of C-nucleosides, carbocyclic nucleosides, and other biologically active molecules that mimic natural nucleosides, which are of significant interest in medicinal chemistry for drug discovery. As a versatile chiral starting material derived from D-ribose, it is employed in organic synthesis to introduce the ribose scaffold into more complex structures. Its applications extend to the preparation of potential antiviral and anticancer agents, where modified nucleosides play a critical role.