Reaction of oximes with dimethyl carbonate: a new entry to 3-methyl-4,5-disubstituted-4-oxazolin-2-ones
摘要:
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.
Iminyl, amidyl, and carbamyl radicals from O-benzoyl oximes and O-benzoyl hydroxamic acid derivatives
作者:Jean Boivin、Anne-Claude Callier-Dublanchet、Béatrice Quiclet-Sire、Anne-Marie Schiano、Samir Z. Zard
DOI:10.1016/0040-4020(95)00319-4
日期:1995.6
Oxime benzoates and O-benzoyl hydroxamic acid derivatives react with tributylstannane in the presence of AIBN to give iminyl, amidyl, and carbamylradicals which can be captured by an internal olefin.