dimethylsulfide; ozone 1.) methanol, -20 deg C, 2 h; 2.) RT, 30 min; Multistep reaction;

1: 1.) ozone; 2.) dimethylsulfide / 1.) methanol, -20 deg C, 2 h; 2.) RT, 30 min 2: 62 percent / PdCl2(PhCN)2, N-methylmorpholine, AgOTf / CH2Cl2; tetrahydrofuran / 12 h / Ambient temperature View Scheme