Hassan AA, Huang ML. Stereoselective synthesis of photoactivatable Man(β1,4)GlcNAc-based bioorthogonal probes.
Tetrahedron Lett 2023;
122:154521. [PMID:
37274137 PMCID:
PMC10237449 DOI:
10.1016/j.tetlet.2023.154521]
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Abstract
We report an operationally facile protocol to prepare photoactivatable probes of the bioactive mammalian disaccharide, Man(β1,4)GlcNAc. Using conformationally restricted mannosyl hemi-acetal donors in a one-pot chlorination, iodination and glycosylation sequence, β-mannosides were generated in excellent diastereoselectivities and yields. Upon accessing the disaccharide, we generated the corresponding photoactivatable probes by appending a diazirine-alkyne equipped linker via a condensation reaction between a diazirine-containing linker and C-1 and C-2 derivatized mannosylamines to furnish the desired C-1 and C-2 modified Man(β1,4)GlcNAc-based probes. This new synthetic protocol greatly simplifies the preparation of this important bioactive disaccharide to enable future work to identify its protein binding partners in cells.
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