Effective Methods for the Synthesis of N-Methyl β-Amino Acids from All Twenty Common α-Amino Acids Using 1,3-Oxazolidin-5-ones and 1,3-Oxazinan-6-ones
Andrew B. Hughes, Brad E. Sleebs
Helvetica Chimica Acta
Volume 89, Issue 11, pages 2611–2637, November 2006
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http://dx.doi.org/10.1002/hlca.200690235