185396-37-6Relevant articles and documents
Construction of chiral α-amino quaternary stereogenic centers via phase-transfer catalyzed enantioselective α-alkylation of α-amidomalonates
Ha, Min Woo,Lee, Myungmo,Choi, Sujee,Kim, Seek,Hong, Suckchang,Park, Yohan,Kim, Mi-Hyun,Kim, Taek-Soo,Lee, Jihoon,Lee, Jae Kyun,Park, Hyeung-Geun
, p. 3270 - 3279 (2015)
An efficient enantioselective synthetic method for α-amido-α-alkylmalonates via phase-transfer catalytic α-alkylation was successfully developed. The α-alkylation of α-amidomalonates under phase-transfer catalytic conditions (50% KOH, toluene, 40 °C) in the presence of (S,S)-3,4,5-trifluorophenyl-NAS bromide afforded the corresponding α-amido-α-alkylmalonates in high chemical yields (up to 99%) and optical yields (up to 97% ee), which could be readily converted to versatile chiral intermediates bearing α-amino quaternary stereogenic centers. The synthetic potential of this methodology was demonstrated via the synthesis of chiral azlactone, oxazoline, and unnatural α-amino acid.
Highly enantioselective synthesis of (R)-α-alkylserines via phase-transfer catalytic alkylation of o-biphenyl-2-oxazoline-4-carboxylic acid tert-butyl ester using cinchona-derived catalysts
Lee, Yeon-Ju,Lee, Jihye,Kim, Mi-Jeong,Kim, Taek-Soo,Park, Hyeung-Geun,Jew, Sang-Sup
, p. 1557 - 1560 (2007/10/03)
(Chemical Equation Presented) A highly enantioselective synthetic method for (R)-α-alkylserines was developed by the phase-transfer catalytic alkylation of obiphenyl-2-oxazoline-4-carboxylic acid tert-butyl ester (4i) using cinchona-derived phase-transfer
α-Hydroxymethylphenylglycine and α-hydroxymethylphenylalanine: Synthesis, resolution, and absolute configuration
Olma
, p. 1442 - 1447 (2007/10/03)
Racemic α-hydroxymethylphenylglycine and α-hydroxymethylphenylalanine have been synthesized by selective hydroxymethylation of oxazolones derived from phenylglycine and phenylalanine, and resolved into enantiomers by fractional crystallization of their di