Novel approach to the ring-opening of 4-isoxazolines: One-pot synthesis of α,β-enones
摘要:
Treatment of 4-isoxazoline derivatives with methyl iodide affords alpha-beta-enones in excellent yields. The novel rearrangement pathway, proceeding through an intermediate isoxazolinium salt, is interpretable on the basis of the base removal of the hydrogen atom at N-CH3 group.
Treatment of 4-isoxazoline derivatives with methyl iodide affords alpha-beta-enones in excellent yields. The novel rearrangement pathway, proceeding through an intermediate isoxazolinium salt, is interpretable on the basis of the base removal of the hydrogen atom at N-CH3 group.
New Rearrangement of 4-Isoxazoline System: Conversion of Ketones into α,β-Unsaturated Amides
A new rearrangement pattern of the 4-isoxazoline system is reported. The reaction, starting from 3,3-disubstituted derivatives and leading to alpha,beta-unsaturated amides, proceeds through the quaternarization of the nitrogen atom and involves the heterolytic cleavage of C(3)-N bond, assisted by the formation of a relatively stable intermediate. The overall process represents a useful conversion of