stereoslective inverse-electron-demand Diels–Alderreactions of masked o-benzoquinones (MOBs) 1a–1h derived from the corresponding 2-methoxyphenols 2a–2h with benzyl vinyl ether, dihydrofuran and styrene to afford the highly functionalized bicyclo[2.2.2]octenone derivatives are described. The MOBs having electron-deficient substituents were found to undergo more facile Diels–Alder cycloadditions with these dienophiles
Iodobenzene and m-chloroperbenzoic acid mediated oxidative dearomatization of phenols
作者:Neha Taneja、Rama Krishna Peddinti
DOI:10.1016/j.tetlet.2016.07.078
日期:2016.8
iodobenzene, and m-CPBA as a co-oxidant has been achieved via in situ generation of PhIO2, a hypervalent iodine(V) species. The transiently generated orthobenzoquinone monoketals further underwent Diels–Alderreaction with various dienophiles to furnish densely substituted bicyclo[2.2.2]octenones in high selectivities and yields. This methodology features ready availability of reagents, cost effectiveness, safety