AIM:To synthesize two novel cinchonidine quaternary ammonium salt chiral catalysts and to apply them in the preparation of L-phenylalanine(L-phe). METHODS: Two new chiral quaternary salts were prepared from cinchona alkaloids and 2-chloromethyl benzimidazole or 1-chloromethyl benzotriazole. The chiral phase transfer catalysts were tested in enantioselective alkylation of N-(diphenylmethylene) glycine t-butyl ester to synthesize(S)-α-benzyl-N-(diphenylmethylene) glycine t-butyl ester, and L-phe was then obta...
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