Abstract
A number of chiral secondary amines attached to Merrifield resin or to noncrosslinked (soluble) polystyrene support were synthesized. The corresponding lithium amides, generated from these amines by treatment with BuLi, react with tropinone, a model symmetrical ketone, to give the corresponding enolates enantioselectively (ee up to 75%). The enolates were trapped either as the corresponding aldol adducts by a reaction with benzaldehyde or as ring-opening products in a reaction with a chloroformate.Key words: chiral lithium amides, polymer-supported reagents, deprotonation, enolates, tropinone.
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