Asymmetric Assembly of All‐Carbon Tertiary/Quaternary Nonadjacent Stereocenters Through Organocatalytic Conjugate Addition of Α‐cyanoacetates to a Methacrylate Equivalent

An efficient, highly diastereo- and enantioselective assembly of acyclic carbonyl fragments possessing nonadjacent all-carbon tertiary/quaternary stereoarrays is reported based on a BrOnsted base catalyzed Michael addition/-protonation sequence involving -cyanoacetates and 2,4-dimethyl-4-hydroxypenten-3-one as novel methacrylate equivalent.