When heated in refluxing benzene or toluene, α-diazo β-ketophosphonates 2, prepared in three steps from aldehydes or ketones, gave rise to functionalized cyclobutenones 4 or phenolic compounds 5. These products are formed by electrocyclisation respectively of a vinyl or dienylketene, resulting from a Wolff rearrangement.
The regiochemistry of the radical addition of N-chloroamides to enol ethers
作者:Gilles Caron、Jean Lessard
DOI:10.1016/s0040-4020(01)88026-1
日期:1993.9
The orientation of the radical addition of N-chloroamides (ZCONHCl) to enolethers was studied as a function of Z and the enolether structure and compared with the orientation of radical addition of thioacetic acid and the orientation of typical electrophilicadditions.
Regiospecific syntheses of quinones using vinylketene acetals derived from unsaturated esters
作者:Jacques Savard、Paul Brassard
DOI:10.1016/s0040-4039(01)86747-2
日期:——
A general method of annellating quinones in high yield has been devised using mixed vinylketene acetals obtained directly from the enolate ions of unsaturated esters.