Synthesis of β-Nicotinamide Riboside Using an Efficient Two-Step Methodology

Area of Science:

• Organic Chemistry
• Biochemistry
• Metabolic Science

Background:

• Nicotinamide riboside (NR) is a vital precursor to nicotinamide adenine dinucleotide (NAD+), a crucial metabolite in mammalian cells.
• Increasing cellular NAD+ concentrations is a target for various therapeutic and health interventions.
• Efficient synthesis of NR is essential for its widespread application.

Purpose of the Study:

• To describe an efficient two-step chemical method for synthesizing β-nicotinamide riboside (NR).
• To achieve high yield and stereoselectivity in the synthesis of β-NR.
• To provide a reliable method for producing this important NAD+ precursor.

Main Methods:

• The synthesis involves coupling 1,2,3,5-tetra-O-acetyl-β-D-ribofuranose with ethyl nicotinate using trimethylsilyl trifluoromethanesulfonate (TMSOTf).
• Stereoselectivity was confirmed using 1H NMR, indicating exclusive formation of the β-isomer.
• A final deprotection step using methanolic ammonia yields the target β-NR.

Main Results:

• The coupling reaction proceeded with complete stereoselectivity, yielding only the β-isomer.
• High yields (>90% for the coupling step) were achieved.
• An overall yield of 85% for β-nicotinamide riboside was obtained from the starting sugar.

Conclusions:

• A highly efficient and stereoselective two-step synthesis for β-nicotinamide riboside has been developed.
• The method utilizes readily available starting materials and standard chemical procedures.
• This optimized synthesis provides a valuable route for producing β-NR, supporting its use as an NAD+ precursor.