Allyl 4,6-O-benzylidene-2-deoxy-2-phtalimido-1-β-D-galactopyranoside

Allyl 4,6- O -benzylidene-2-deoxy-2-phthalimido-1-β-D-galactopyranoside Allyl 4,6- O -benzylidene-2-deoxy-2-phthalimido-1-β-D-galactopyranoside is a synthetic glycoside derivative designed for advanced carbohydrate chemistry applications. This compound integrates multiple protecting groups to enable controlled reactivity during oligosaccharide synthesis. Chemical Structure The molecule is based on a β-D-galactopyranoside scaffold with the following modifications: 1-Allyl group : An allyl group at the anomeric position, forming a glycosidic linkage that enhances stability and serves as a glycosyl donor in synthetic reactions. 4,6- O -benzylidene group : A benzylidene acetal protection spanning positions 4 and 6, providing stability under acidic conditions and enabling selective deprotection later. 2-Deoxy-2-phthalimido group : A 2-amino sugar derivative protected by a phthalimido group, which is acid-stable and removable via mild hydrolysis (e.g., hydrazine). Key Properties Molecular formula : Estimated to be C23H25NO6 ext{C}_{23} ext{H}_{25} ext{NO}_6 C23H25NO6 based on analogous structures. Stereochemistry : β-configuration at the anomeric center (C1), critical for mimicking biological glycosylation patterns. Role in synthesis : The allyl group facilitates activation for glycosylation reactions. Benzylidene group ensures regioselective reactivity, while phthalimido protects the amino group during glycosylation steps. Applications This compound is used in solid-phase oligosaccharide synthesis to build complex glycans. Its design supports iterative coupling cycles, where the benzylidene group can be selectively removed to expose the 4-OH and 6-OH for subsequent glycosylation. The phthalimido group remains intact during these steps, enabling late-stage functionalization of the amino group. Synthetic Considerations Preparation : Likely synthesized via sequential protection: Phthalimidation of galactose at position 2. Benzylidene protection at positions 4 and 6. Allylation at the anomeric position. Stability : Stable under standard glycosylation conditions but sensitive to conditions that cleave the benzylidene group. This multifunctional building block exemplifies advanced strategies in glycochemistry , balancing stability and orthogonality for automated glycan assembly. Citations: https://pubs.rsc.org/en/content/getauthorversionpdf/c9ob01610d https://pubmed.ncbi.nlm.nih.gov/1394300/ https://pubs.acs.org/doi/10.1021/jo00296a055 https://patents.google.com/patent/US20040019198A1/en https://pmc.ncbi.nlm.nih.gov/articles/PMC6474417/