Oxalyl chloride (0.052 ml) was added to a stirred suspension of (R)-(+)-2-hydroxy-2-methyl-3,3,3-trifluoropropanoic acid (Method 9) (0.095 g) in dichloromethane (3 ml) containing DMF (1 drop). The mixture was stirred at ambient temperature for 2 hours and was then added to a solution of 2-bromo-4-phenylthioaniline (Method 17) (0.135 g) and 2,6-di-tert-butylpyridine (0.14 ml) in dichloromethane (5 ml) and stirred a further 3 hours. Volatile material was removed by evaporation and the residue was purified by chromatography on a silica gel Mega Bond Elut column eluting with 0-30% ethyl acetate/hexane to give the title compound (0.061 g) as a waxy solid. NMR: 1.59 (s, 3H), 7.25-7.50 (bm, 6H), 7.59 (s, 1H), 7.82 (bs, 1H), 7.98 (d,1H), 9.79 (s, 1H); MS: 420 (M−H)−.
