The alkaloids mesembrine (1; R1= R2= O) and mesembrenone (2) undergo a novel oxidation with diethyl azodicarboxylate to afford the β-enaminoketones (4) and (6), respectively.
P. W. Jeffs, H. F. Campbell and R. L. Hawks, J. Chem. Soc. D, 1971, 1338b DOI: 10.1039/C2971001338B
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