Nonreducing disaccharide trehalose is used as a stabilizer and humectant in various products and is a potential medicinal drug, showing curative effects on the animal models of various diseases. However, its use is limited as it is hydrolyzed by trehalase, a widely expressed enzyme in multiple organisms. Several trehalose analogs are prepared, including a microbial metabolite 4‐trehalosamine, and their high biological stability is confirmed. For further analysis, 4‐trehalosamine is selected as it shows high producibility. Compared with trehalose, 4‐trehalosamine exhibits better or comparable protective activities and a high buffer capacity around the neutral pH. Another advantage of 4‐trehalosamine is its chemical modifiability: simple reactions produce its various derivatives. Labeled probes and detergents are synthesized in one‐pot reactions to exemplify the feasibility of their production, and their utility is confirmed for their respective applications. The labeled probes are used for mycobacterial staining. Although the derivative detergents can be effectively used in membrane protein research, long‐chain detergents show 1000–3000‐fold stronger autophagy‐inducing activity in cultured cells than trehalose and are expected to become a drug lead and research reagent. These results indicate that 4‐trehalosamine is a useful trehalose substitute for various purposes and a material to produce new useful derivative substances.
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