We report a novel bifunctional cyanating reagent, Me-2(CH2Cl)SiCN, which paves the way to a one pot sequential synthesis of tertiary alcohols featuring a chloromethyl ketone moiety via enantioselective ketone cyanosilylation. This method contributes to gram-scale enantioselective total synthesis of the aggregation pheromone of the Colorado potato beetle, (S)-CPB.