Abstract An efficient method for the regioselective preparation of 1,3-dimethylenecyclobutanes based on Ru-catalyzed dimerization of readily available CF3-containing functionalized allenes including α-amino acid derivatives have been developed. The reactions smoothly… Click to show full abstract
Abstract An efficient method for the regioselective preparation of 1,3-dimethylenecyclobutanes based on Ru-catalyzed dimerization of readily available CF3-containing functionalized allenes including α-amino acid derivatives have been developed. The reactions smoothly proceed in toluene at 100 °C in the presence of catalytic amounts (5 mol%) of naphthalene-containing ruthenium system [Cp*Ru(C10H8)]PF6/[Et3NBn]Cl to afford exclusively tail-to-tail coupling products in good to excellent yields.
               
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