To a solution of 3-bromomethyl-7-(2,2-dimethyl-propionyloxy)-4-phenyl-isothiazolo[4,5-c]pyridine-6-carboxylic acid butyl ester (86.1 mg) in DMF (0.85 mL) at 0° C. was added indole (39.9 mg) and 60% NaH (13.6 mg). The reaction mixture was allowed to warm up to r.t. and stirred for 2 h before water (20 mL) was added. The mixture was extracted with EtOAc (4×20 mL). The combined organic phases were washed with brine and water, dried over MgSO4, and concentrated in vacuo. The residue was purified by flash chromatography on silica gel. Eluting with 1-50% EtOAc/hexanes gave the title compound (11 mg) as a white solid: MS (m/z) 458.2 (M+1).
