A unique, regioselective 7-methylation reaction has been discovered during the reductive 3-alkylation of isatin with i-BuOH at 230 degrees C, in the presence of Raney nickel, under hydrogen atmosphere. Based on this observation, a synthetic method has been elaborated for the preparation of 3-alkyl-7methyloxindoles.
derivatization of oxindole is of considerable current interest. The extreme reaction conditions (high temperature, high pressure) described in the literature for the batchwise regioselective multistep 3-alkylation of oxindole with alcohols in the presence of Raney nickel motivated us to develop a robust, time- and cost-efficient continuous-flow variant for this reaction. In addition, the continuous-flow technology
A unique, regioselective 7-methylation reaction has been discovered during the reductive 3-alkylation of isatin with i-BuOH at 230 degrees C, in the presence of Raney nickel, under hydrogen atmosphere. Based on this observation, a synthetic method has been elaborated for the preparation of 3-alkyl-7methyloxindoles.