Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, Journal of Organic Chemistry called Synthesis of 1,2-fused tricyclic indoles via Cu-/base-mediated hydroamination of alkynes, Author is Hojo, Ryoga; Short, Spencer; Jha, Mukund, which mentions a compound: 16400-32-1, SMILESS is CCC#CCBr, Molecular C5H7Br, Computed Properties of C5H7Br.
Synthesis of a variety of 1,2-fused tricyclic S-containing indoles is reported starting from indole sulfides tethered with terminal and internal alkynes via a key hydroamination step. Cu-catalyzed hydroamination reactions resulted in the exclusive formation of tricycles possessing an exocyclic methylene moiety, whereas base-mediated conditions led to thiazolo[3,2-a]indoles. Indole sulfides with internal alkyne functionality produced 2H-[1,3]thiazino[3,2-a]indoles under Cu-catalysis.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics