Abstract

A new polymer-supported BINOL (1,1‘-Bi-2-naphthol) was synthesized by coupling of aminomethyl polystyrene resin and (S)-2,2‘-dihydroxy-1,1‘-binaphthyl-3,3‘-dicarboxylic acid. This new ligand was found to be more enantioselective for the asymmetric addition of diethylzinc to aldehydes than its “free” analog [Ti(BINOL)iPrO2]. A range of 57−99% ee's as well as 78−97% yields was obtained, and the electronic properties of the enantioselectivity were also observed.

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