Construction of 2-pyridones <i>via</i> oxidative cyclization of enamides: access to Pechmann dye derivatives
作者:Sivanna Chithanna、Ding-Yah Yang
DOI:10.1039/d0ob02376k
日期:——
dehydrogenation. The cyclization of enamides was achieved by the introduction of an electron-withdrawing group on the α-carbon of acid chlorides. This methodology allows quick access to polycyclic Pechmanndyes via rare double oxidative cyclizations of dienamides under mild conditions.
Lenz,G.R., Journal of Heterocyclic Chemistry, 1979, vol. 16, p. 433 - 437
作者:Lenz,G.R.
DOI:——
日期:——
Photocyclization of coumarinoyl enamides revisited: [2+2+2] cycloreversion/cycloaddition mechanism
作者:Sivanna Chithanna、Ding-Yah Yang
DOI:10.1039/d1nj00352f
日期:——
The major and minor products for the photocyclization of coumarinoyl enamides were identified. Controlled and intermediate-trapping experiments indicate that the formation of the minor isomer involved a stepwise, radical [2+2+2] cycloreversion/cycloaddition mechanism. Deuteriumlabeling studies suggest that the photocyclization of both aroyl and alkenoyl enamides involved a [1,5] hydrogen shift as