Solvent- and supporting electrolyte-free electrolysis in a two-compartment cell proved to be effective for the direct electroactivation of CH acid-containing compounds vs. catalytic addition processes. Michael adducts (including quaternary carbon centres) and 2-nitroalkanols were obtained in very good yields and selectivity on application of a catalytic amount of electricity under galvanostatic conditions
Silica gel-mediated catalyst-free and solvent-free Michael addition of 1,3-dicarbonyl compounds to highly toxic methyl vinyl ketone without volatilization
作者:Kiyoshi Tanemura、Taoufik Rohand
DOI:10.1016/j.tetlet.2020.152142
日期:2020.7
Silica gel-mediated Michaeladdition of 1,3-dicarbonyl compounds to methyl vinylketone (MVK) and ethyl vinylketone (EVK) was carried out to give the corresponding adducts in quite excellent yields. The reactions could be carried out without any catalysts and solvents. In addition, highly toxic MVK and EVK could be employed without significant volatilization. Silica gel could be recycled five times