Journal
ORGANIC LETTERS
Volume 5, Issue 21, Pages 3887-3890Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol0354730
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[GRAPHICS] A novel class of peptidomimetics having a stereogenic [CH(CF3)NH] replacement for a [CONH] peptide bond has been synthesized, The new compounds have been obtained in a stereocontrolled fashion using a kinetically controlled aza-Michael addition of chiral alpha-amino acid esters to trans-3,3,3-trifluoro-1-nitropropene. The stereoselectivity is strongly influenced by the solvent, the base, its stoichiometry, and the R side-chain. Diastereomeric ratios higher than 11:1 were achieved using H-Val-OtBu.HCl in toluene with 1.1 equiv of DIPEA.
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