Schoellkopf, Ulrich; Groth, Ulrich; Hartwig, Wolfgang, Liebigs Annalen der Chemie, 1981, # 12, p. 2407 - 2418
作者:Schoellkopf, Ulrich、Groth, Ulrich、Hartwig, Wolfgang
DOI:——
日期:——
Enantioselective synthesis of non-proteinogenic amino acids via metallated bis-lactim ethers of 2,5-diketopiperazines
作者:Ulrich Schöllkopf
DOI:10.1016/s0040-4020(01)91926-x
日期:1983.1
excess = asymmetric induction) of the adduct exceeds 95%. On hydrolysis the adducts are cleaved liberating the chiral auxiliary (used to build up the bis-lactim ether 1) and the target molecules, the opticallyactive amino acid methyl esters of type 8,19,25 or 36. The two amino acid esters are separable either by fractional distillation or (eventually after further hydrolysis to amino acids) by chromatography