A novel chiral ruthenium porphyrin as highly efficient and selective catalyst for asymmetric cyclopropanations

Asymmetric Cyclopropanation of Styrene Catalyzed by Cu–(Chiral Schiff-Base) Complexes

“…These results are comparable to the results with the most efficient catalysts reported to date, including Cu-semicorrin, Cu-bisoxazoline, Cu-bipyridine, etc. [10][11][12][13][14][15][16][17][18][19] Furthermore, when one or two chlorine atoms or nitro groups are introduced, the ligands formed are easy to purify due to their high melting points. A recrystallization is sufficient to purify them.…”

Spectral, Structural, and Electrochemical Properties of Ruthenium Porphyrin Diaryl and Aryl(alkoxycarbonyl) Carbene Complexes: Influence of Carbene Substituents, Porphyrin Substituents, and trans‐Axial Ligands

“…[1c, f, g] Our interest in metal carbene complexes lies in their reactivity in carbenoid transfer reactions, and recent investigations focused on alkene cyclopropanation with iron, [2] ruthenium, [3] or osmium [4] porphyrin catalysts. We and the groups of Woo,[5] Simonneaux, [6] Berkessel, [7] and Gross [8] have found a series of iron, ruthenium, and osmium porphyrins that are active catalysts for cyclopropanation of alkenes with diazo compounds. Of particular note is the asymmetric cyclopropanation of styrenes with ethyl diazo- ) that is attributable to a metal-centered oxidation.…”

Cyclopropanation of Olefins with Diazoalkanes, Catalyzed by CoII(porphyrin) Complexes − A Synthetic and Mechanistic Investigation and the Molecular Structure of CoIII(TPP)(CH2CO2Et) (TPP = Dianion of meso‐Tetraphenylporphyrin)

“…This new signal is attributable to an unstable intermediate (8), since it gradually disappeared and at the end of the reaction only the absorptions due to diethyl maleate (ν CO ϭ 1730, 1750 cm…”