1-Bromo-2-butyne is used in the synthesis of six to eight annulated ring compounds in reactions with indoles. It is also used in the preparation of Pseudopterane (+/-)-Kallolide B, a marine natural product.
Ferrer, C. et al.: Chem. A. Eur. J. et al.: 13, 1358 (2007); Marshall, J. et al.: J. Org. Chem., 60, 796 (1995);