Diastereoselective Electrophilic Amination of Chiral 1-Benzoyl-2,3,5,6-tetrahydro-3-methyl-2-(1-methylethyl)pyrimidin-4(1H)-one for the Asymmetric Syntheses ofα-Substitutedα,β-Diaminopropanoic Acids
The chiral compounds (R)- and (S)-1-benzoyl-2,3,5,6-tetrahydro-3-methyl-2-(1-methylethyl)pyrimidin-4(1H)-one ((R)- and (S)-1), derived from (R)- and (S)-asparagine, respectively, were used as convenient starting materials for the preparation of the enantiomerically pure α-alkylated (alkyl=Me, Et, Bn) α,β-diamino acids (R)- and (S)-11–13. The chiral lithium enolates of (R)- and (S)-1 were first alkylated
An Efficient Synthesis of Optically Pure (<i>R</i>)- and (<i>S</i>)-2-(aminomethyl)alanine ((<i>R</i>)- and (<i>S</i>)-ama) and (<i>R</i>)- and (<i>S</i>)-2-(aminomethyl)leucine ((<i>R</i>)- and (<i>S</i>)-aml)
An efficient synthesis of enantiomerically pure (R)- and (S)-2-(aminomethyl)alanine ((R)- and (S)-Ama) 1a and (R)- and (S)-2-(aminomethyl)leucine ((R)- and (S)-Aml) 1b is described (Schemes 1 and 2). Resolution of the racemic amino acids was achieved using L-phenylalanine cyclohexylamide (2) as chiral auxiliary. The free amino acids 1a, b were converted to the Nα-Boc,Nγ-Z-protected derivatives 11a
Stereoselective amination of chiral enolates: Synthesis of enantiomerically pure α,β-diamino acids, chiral key compounds in the synthesis of conformationally constrained peptido- and non-peptidomimetics
作者:Ramón Badorrey、Carlos Cativiela、Maria D. Diaz-de-Villegas、JoséA. Gálvez
DOI:10.1016/0957-4166(95)00368-y
日期:1995.11
This work describes an efficient synthesis of enantiomericallypure (R)-2-aminomethylalanine, (R)-2-aminomethylnorvaline, (R)-2-aminomethylvaline, (R)-2-aminomethylleucine and (R)-2-aminomethylphenylalanine by electrophilic amination of chiral 2-cyanoesters with O-(diphenylphosphinyl)hydroxylamine followed by appropiate reduction and hydrolysis.