K. Teranishi et al., A FACILE BIOMIMETIC SYNTHESIS OF UHLES KETONE BY THE REGIOSELECTIVE FRIEDEL-CRAFTS CYCLIZATION OF INDOLE-3-YLPROPIONYL CHLORIDE, Tetrahedron letters, 35(44), 1994, pp. 8173-8176
In the presence of a larg amount of oxocarbonium ion species generated
from chloroacetyl chloride and aluminum chloride, 3-(1-trimtrhylacety
lindol-3yl)-propionyl chloride reacts regioselectively to give a pival
oyl derivative of Uhle's ketone in excellent yield