boron tribromide; triethylamine; N,N'-[(1S,2S)-1,2-diphenylethane-1,2-diyl]bis[3,5-bis(trifluoromethyl)-benzenesulfonamide] in hexane; toluene 1.) -78 deg C, 24 h, 2.) -20 deg C, 14 d; Yield given. Yields of byproduct given;

acetic acid; zinc T=65°C; 1.5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;