N-acetyl derivatives of L-glutamine, L-proline, and 4-hydroxy-L-proline were synthesized in aqueous solutions with acetic anhydride as the acetylating agent. The resulting compounds were used as medicinal substances.

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2-Amino-4-acetylthiazolo[5,4-b]indole and its bromosubstituted analogue contain a free amino group and are initial compounds for chemical modification in order to obtain on their basis functional derivatives having high therapeutic activity. By the interaction of these 2-aminо-4-acetylthiazolo[5,4-b]indoles with succinic and maleic anhydrides, the corresponding imides and amides were obtained, which are of interest for use in order to create on their basis antihypoxic and actoprotective agents.