Reaction of oximes with dimethyl carbonate: a new entry to 3-methyl-4,5-disubstituted-4-oxazolin-2-ones
作者:C. A. Marques、M. Selva、P. Tundo、F. Montanari
DOI:10.1021/jo00073a041
日期:1993.10
The reaction of ketone oximes with dimethyl carbonate (DMC) carried out in an autoclave at 180-190-degrees-C and in the presence of K2CO3 yields 3-methyl-4,5-disubstituted-4-oxazolin-2-ones. The reaction can be applied to both aliphatic and aromatic ketone oximes, provided that a methylene group be present near the C=N bond. Nonoptimized yields range from 22 to 48%. The reaction seems to be a [3,3] sigmatropic rearrangement where DMC plays a key role in causing the initial N-methylation of the oximes.
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