A mixture of 2-tert-butyl-4-chloro-5-phenylisothiazol-3(2H)-one 1,1-dioxide (0.150 g, 0.500 mmol), (4-pyrrolidin-1-ylphenyl)amine (0.081 g, 0.500 mmol) and TEA (0.070 ml, 0.500 mmol) in MeCN (2 ml) and DMF (1 ml) was heated in a microwave reactor at 120° C. for 45 mins. TEA (0.070 ml, 0.500 mmol) was added and the mixture was heated at 120° C. for 15 mins. The precipitate from the reaction mixture was isolated by filtration and washed with MeCN. The crude product was dissolved in MeOH and purified by silica gel column chromatography using 15-100% EtOAc in petroleum ether 40-60° C. as eluent, to give the title compound (0.146 g, 69%). 1H NMR (500 MHz, CDCl3): δ 7.22-7.02 (m, 5H), 6.55 (d, 2H), 6.14 (d, 2H), 3.15-3.10 (m, 4H), 1.99-1.92 (m, 4H), 1.77 (s, 9H); 13C NMR (125 MHz CDCl3): δ 160.8, 149.9, 131.6, 129.7, 128.5, 127.9, 125.5, 124.7, 123.9, 111.2, 108.8, 61.8, 47.9, 27.9, 25.6; Mass Spectrum: M+H+ 426.
