Design and Synthesis of Optically Active Esters of γ-Amino-β-oxo Acids as Precursors for the Synthesis of Tetramic Acids Derived from L-Serine, L-Tyrosine, and L-Threonine
作者:Dimitris Matiadis、Olga Igglessi-Markopoulou
DOI:10.1002/ejoc.201000700
日期:2010.11
Tetramic acids bearing a hydroxyalkyl or hydroxybenzyl group at C-5 of the heterocyclic ring were successfully prepared. α-Amino acids appropriately protected and activated were used as acylating agents for the C-acylation of active methylene compounds. These novel synthesized intermediates, substituted γ-amino acids, were isolated in excellent yields and enantiomeric purities. Cyclization under basic