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To a cooled (-20° C.) solution of α-trifluoromethyl lactic acid 0.20 g in dry N,N-dimethylacetamide (4 ml) was added thionyl chloride (0.16 g). The reaction mixture was stirred for 1 hour, then warmed to 0° C. over 30 minutes and treated with 4-(N-phenyl-N-methylaminosulfonyl)aniline (0.34 g). After stirring at 22° C. for 24 hours, the reaction mixture was diluted with water (30 ml) and extracted with ethyl acetate (2×20 ml). The combined ethyl acetate extracts were washed with brine, dried (Na2SO4) and concentrated at reduced pressure to give an oil which was purified by chromatography (1:1 hexane: ethyl aceate) and recrystallised from methyl-t-butyl ether/hexane to produce the title compound as a colourless solid (0.31 g); mp 147°-149° C.; MS: m/z=403(M+1); NMR (250 MHz): 1.55 (s,3), 3.09 (s,3), 7.05-7.08 (m, 2), 7.28-7.43 (m,5), 7.53 (s,1), 7.91-7.95 (m,2), 10.36 (broad s, 1). Analysis for C17H17F3N2O4S: Calculated: C, 50.78; H, 4.26; N, 6.97; Found: C, 50.80; H, 4.37; N, 6.93.

1. stirringAfter stirring at 22° C. for 24 hours
2. extractionextracted with ethyl acetate (2×20 ml)
3. washThe combined ethyl acetate extracts were washed with brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated at reduced pressure
6. customto give an oil which
7. customwas purified by chromatography (1:1 hexane: ethyl aceate)
8. customrecrystallised from methyl-t-butyl ether/hexane