1: 1.) oxalyl chloride/DMSO; 2.) Et3N / CH2Cl2 / 1.) -78 deg C, 17 min; 2.) a.) -78 deg C, 5 min; b.) RT, 30 min 2: K2CO3 / methanol / 12 h / Ambient temperature View Scheme

ee = 78percent; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

1: 1.) oxalyl chloride/DMSO; 2.) Et3N / CH2Cl2 / 1.) -78 deg C, 17 min; 2.) a.) -78 deg C, 5 min; b.) RT, 30 min 2: K2CO3 / methanol / 12 h / Ambient temperature View Scheme

ee = 78percent; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;