Cleavage of β-Ketoesters <i>Via</i> Iminyl Radicals-Application in the Synthesis of a Spirolactone
作者:V. Sridar、G. Babu
DOI:10.1080/00397919708005035
日期:1997.1
Reaction of Oximebenzoates of several beta-ketoesters with tributyltin hydride show beta-cleavage via an iminyl radical and application of this results in the synthesis of a spirolactone.
Lewis Acid Catalyzed Synthesis of α-Trifluoromethyl Esters and Lactones by Electrophilic Trifluoromethylation
An electrophilictrifluoromethylation of ketene silyl acetals (KSAs) by hypervalent iodine reagents 1 and 2 has been developed. The reaction proceeds under very mild conditions in the presence of a catalytic amount of trimethylsilyl bis(trifluoromethanesulfonyl)imide (up to 2.5 mol %) as a Lewis acid providing a direct access to a variety of secondary, tertiary, and quaternaryα-trifluoromethyl esters