The enantioselective copper-catalyzed oxidative desymmetrization for the synthesis of chiral α-substituted serine derivatives is reported. The combination of Cu(OTf)2/(R,R)-PhBOX catalyst system, N-bromosuccinimide, and MeOH enables us to provide chiral α-substituted serines from N-2-methylbenzoyl-protected 2-amino-1,3-diols through a simple procedure at room temperature under an air atmosphere. A
Theoretical Evidence for Pyramidalized Bicyclic Serine Enolates in Highly Diastereoselective Alkylations
作者:Carlos Aydillo、Gonzalo Jiménez-Osés、Jesús H. Busto、Jesús M. Peregrina、María M. Zurbano、Alberto Avenoza
DOI:10.1002/chem.200601746
日期:2007.6.4
and its enantiomer have been synthesized from (S)- and (R)-N-Boc-serine methyl esters (Boc: tert-butyloxycarbonyl). The use of these compounds as chiral building blocks has been demonstrated in the synthesis of alpha-alkyl alpha-amino acids by diastereoselective potassium enolate alkylation reactions and subsequent acid hydrolyses. Theoretical studies were performed to elucidate the stereochemical