methanesulfonyl chloride; triethylamine in dichloromethane T=-18 - -15°C; 1.25 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

triethylamine in dichloromethane T=-18 - -15°C; 1.25 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;