1,5-disubstituted 1,2,3-triazolylated carbohydrates and nucleosides

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Carbohydrate Chemistry

Background:

• 1,5-disubstituted 1,2,3-triazoles are less common than 1,4-isomers.
• Synthesis of 1,5-triazoles, particularly in carbohydrates and nucleosides, is complex.
• Traditional methods yield mixtures, and ruthenium catalysis raises toxicity concerns.

Purpose of the Study:

• To review synthetic strategies for 1,5-disubstituted 1,2,3-triazoles.
• To highlight applications in biological systems.
• To discuss advancements in metal-free synthesis.

Main Methods:

• Literature review of pre-Click and post-2001 synthetic methods.
• Analysis of regioselective synthesis approaches.
• Discussion of challenges in carbohydrate and nucleoside derivatization.

Main Results:

• 1,5-disubstituted triazoles present unique synthetic hurdles compared to 1,4-isomers.
• Ruthenium catalysis offers regioselectivity but poses metal contamination risks.
• Development of non-toxic and metal-free synthetic routes is an active research area.

Conclusions:

• Efficient and safe synthesis of 1,5-disubstituted 1,2,3-triazoles is crucial for their biological applications.
• Metal-free synthetic methodologies are increasingly important.
• Further research is needed to overcome existing synthetic challenges.