Abstract
New chiral calix[4]arene derivatives have been synthesized by appending at the lower rim amino acid ( l-tyrosine, l-aspartic acid, l-valine, and l-tryptophan) or pinene-like (myrtenyl and homomyrtenyl) units or by distal intrabridging with a binaphthyl amine scaffold. The application of these derivatives in enantioselective catalysis was studied by testing the catalytic activities of the corresponding Ti(IV)/calixarene complexes, prepared in situ, in the asymmetric aldol reaction of Chan’s silyloxydiene with p-nitrobenzaldehyde.
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