Zhang, Haiming published the artcileSynthesis of β- and γ-Carbolines by the Palladium/Copper-Catalyzed Coupling and Cyclization of Terminal Acetylenes, Safety of 2-Iodobenzofuran, the publication is Journal of Organic Chemistry (2002), 67(20), 7048-7056, database is CAplus and MEDLINE.
A variety of 3-substituted β- and γ-carbolines have been synthesized from N-substituted 3-iodoindole-2-carboxaldehydes and 2-bromoindole-3-carboxaldehydes, resp. The coupling of these aldehydes with various terminal acetylenes with PdCl2(PPh3)2/CuI as the catalyst readily affords the corresponding alkynylindolecarboxaldehydes, which have subsequently been converted to the corresponding tert-butylimines and cyclized to β- and γ-carbolines by either copper-catalyzed or thermal processes.
Journal of Organic Chemistry published new progress about 69626-75-1. 69626-75-1 belongs to benzofurans, auxiliary class Iodide,Benzofuran, name is 2-Iodobenzofuran, and the molecular formula is C6H8N2O2, Safety of 2-Iodobenzofuran.
Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem