P. Darkins et al., FIRST SYNTHESIS OF ENANTIOMERICALLY PURE N-PROTECTED BETA-AMINO-ALPHA-KETO ESTERS FROM ALPHA-AMINO-ACIDS AND DIPEPTIDES, Tetrahedron : asymmetry, 5(2), 1994, pp. 195-198
A racemization-free route from N-protected alpha-amino acids and dipep
tides to N-protected beta-amino-alpha-keto esters is described, involv
ing the sequence: diazoketone formation. Wolff rearrangement in methan
ol, diazo transfer, and oxidation with dimethyldioxirane.