Gold Catalysis: Deuterated Substrates as the Key for an Experimental Insight into the Mechanism and Selectivity of the Phenol Synthesis
作者:A. Stephen K. Hashmi、Matthias Rudolph、Hans-Ullrich Siehl、Masato Tanaka、Jan W. Bats、Wolfgang Frey
DOI:10.1002/chem.200701795
日期:2008.4.18
influence of neighboring substituents. This is supported by quantum chemical calculations of the intermediates. The lack of exchange of deuterium labels excludes even equilibria with acetylide or vinylidene intermediates and the observed deuterium distribution in the final products is in accord with the NIH-shift reaction. In addition, these findings now explain previously obtained results.
Combining Gold and Palladium Catalysis: One-Pot Access to Pentasubstituted Arenes from Furan-Yne and En-Diyne Substrates
作者:A. Stephen K. Hashmi、Mohammad Ghanbari、Matthias Rudolph、Frank Rominger
DOI:10.1002/chem.201200091
日期:2012.6.25
A series of furan–yne systems was transformed into the corresponding tetrasubstituted annelated phenol derivatives that bear one bromo group. The two‐step procedure consisted of a phenol synthesis and a subsequent electrophilic bromination with N‐bromosuccinimide (NBS). The reactions can be performed in a one‐pot procedure with the same precatalyst. The halogenation reaction is highly selective only