In the presence of a larg amount of oxocarbonium ion species generated from chloroacetyl chloride and aluminum chloride, 3-(1-trimethylacetylindol-3yl)-propionyl chloride reacts regioselectively to give a pivaloyl derivative of Uhle's ketone in excellent yield.
eco-friendly synthesis of CF3-containing spirocyclicindolines. The cascade reaction comprised anodic oxidation to obtain CF3 radicals, the addition of radicals to indoles, and intramolecular spirocyclization. The reaction system without external chemical oxidants could easily be scaled up. Antiproliferation assays of these CF3-substituted spirocyclicindolines exhibited their promising activities and
A facile synthesis of Uhle’s ketone starting from 3-(indol-3-yl)propionic acid is described. In the presence of a large amount of donor-acceptor complex, the species generated from chloroacetyl chloride and aluminum chloride, 3-(1-trimethylacetylindol-3-yl)propionyl chloride reacts regioselectively to give trimethylacetyl derivative of Uhle’s ketone in 78% yield. Deacylation of trimethylacetyl group gives Uhle’s ketone in an overall yield of 67%.