Intramolecular Cyclotrimerization of Triynes Catalyzed by N-Heterocyclic Carbene−CoCl2/Zn or −FeCl3/Zn
N Saino, D Kogure, S Okamoto - Organic Letters, 2005 - ACS Publications
N Saino, D Kogure, S Okamoto
Organic Letters, 2005•ACS Publications… Herein we describe a novel Cp- and CO-free system for cyclotrimerization of triynes
which is catalyzed by a CoCl 2 −imidazolium carbene 8 reagent in the presence of Zn
powder, and we also found that an FeCl 3 −imidazolium carbene reagent in the presence of
Zn powder can effectively catalyze cyclotrimerization. … In summary, we have found that
transition metal salts of Co, Fe, Pd, and Ni could catalyze intramolecular cyclotrimerization
of triynes in the presence of imidazolium carbene and zinc powder. The reagent …
which is catalyzed by a CoCl 2 −imidazolium carbene 8 reagent in the presence of Zn
powder, and we also found that an FeCl 3 −imidazolium carbene reagent in the presence of
Zn powder can effectively catalyze cyclotrimerization. … In summary, we have found that
transition metal salts of Co, Fe, Pd, and Ni could catalyze intramolecular cyclotrimerization
of triynes in the presence of imidazolium carbene and zinc powder. The reagent …
Triynes 1 could effectively be cyclotrimerized to annulated benzenes 2 by treatment with a catalytic amount of zinc powder, N-heterocyclic carbene, and CoCl2 or FeCl3.
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