Formation of polyaromatic compounds by coupling of aryl iodides with arylacetylenes in the presence of palladium-based ligand-free catalytic systems
作者:E. V. Larina、A. A. Kurokhtina、E. V. Yarosh、N. A. Lagoda、A. F. Schmidt
DOI:10.1134/s1070428016090190
日期:2016.9
nucleophilic substitution of halogen (b) in the product of oxidative addition (a) of organic halide to Pd(0) by acetylide ion (Scheme 1). Carbopalladation of acetylene gives σ-alkenyl palladiumcomplex analogous to products of oxidative addition of vinyl halides to Pd(0). It is known that the stability of such complexes (even when β-hydrogen atoms are present therein) allows catalytic coupling of vinyl halides
Synthesis of tetrasubstituted benzenes via rhodium(i)-catalysed ring-opening benzannulation of cyclobutenols with alkynes
作者:Takanori Matsuda、Norio Miura
DOI:10.1039/c3ob40436f
日期:——
A formal [4 + 2] annulation occurs between 1,3-disubstituted cyclobutenols and internal alkynes in the presence of rhodium(I) catalysts to afford 1,2,3,5-tetrasubstituted benzenes. These benzannulation products are generated through dehydration of the initially formed cyclohexadienols.