Gold Catalysis: Domino Reaction of En-Diynes to Highly Substituted Phenols
作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/chem.201100305
日期:2011.7.11
2‐iodoallyl alcohols, various substrates that bear a 2‐alkynylallyl alcohol moiety tethered to an additional alkyne were prepared in one step. Subjection to nitrogen acyclic carbene (NAC)/gold(I) catalysts delivered highlysubstituted phenols in an efficient domino reaction. Furan derivatives were formed as intermediates; this was proven by in situ NMR spectroscopy. The uncommon substitution pattern of
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