An Air‐ and Water‐Stable Hydrogen‐Bond‐Donor Catalyst for the Enantioselective Generation of Quaternary Carbon Stereocenters by Additions of Substituted Cyanoacetate Esters to Acetylenic Esters

The chiral enantiopure cobalt(III) complex Δ‐[Co((S,S)‐dpen)3]3+ 2Cl−B(C6F5)4− (Δ‐(S,S)‐23+ 2Cl−B(C6F5)4−; dpen=1,2‐diphenylethylenediamine) is an effective catalyst, together with pyridine (10 mol % each), for enantioselective additions of substituted cyanoacetate esters NCCH(R)CO2R′ to acetylenic...

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