1: (C2H5)3N, 4-dimethylaminopyridine / 1) 0 deg C, 1 h, 2) 25 deg C, 24 h 2: 1) O3, 2) (CH3)2S / 1) CH2Cl2, -78 deg C, 3 h, 2) 25 deg C, overnight View Scheme

potassium permanganate; acetone

dimethylsulfide; ozone 1) CH2Cl2, -78 deg C, 3 h, 2) 25 deg C, overnight; Multistep reaction. Title compound not separated from byproducts;