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A very efficient, chiral phase-transfer catalyst (S)-2Db was prepared by taking advantage of the combinatorial approach from the known, easily available (S)-1,1′-binaphthyl-2,2′-dicarboxylic acid. This catalyst exhibited the high catalytic performance (0.01–0.1mol%) in the asymmetric alkylation of N-(diphenylmethylene)glycine tert-butyl ester compared to the existing chiral phase-transfer catalysts,...
The selective monoalkylation of glycine tert-butyl ester aldimine Schiff base 3 has been realized in high chemical yield with excellent enantioselectivity under mild liquid–liquid phase-transfer conditions by the use of binaphthyl-derived chiral quaternary ammonium bromides 7 and 8 as catalysts. This achievement demonstrates that 3 can be used as a cost-effective substrate for the preparation of optically...
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