Enantioselective synthesis of hydroxy-substituted ?-methyl-?-amino acids using Al and Mn derivatives of cyclo-(L-Ala-L-AIa) bis-Iactim ethers
摘要:
Aluminum and manganese derivatives of lithiated bis-lactim ethers of cyclo-(L-Ala-L-Ala) were used for the enantioselective synthesis of beta-hydroxy and polyhydroxy alpha-amino acids of the 2-methylserine series. A new variant of the synthesis of these acids via 3-acyl-2,5-dialkoxy-3,6-dimethyl-3,6-dihydropyrazines is proposed.