Hydrochloric Acid → 6-(1H-Indol-4-yl)-4-{5-[(phenylsulfonyl)methyl]-1,3,4-oxadiazol-2-yl}-1H-indazole

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4-[5-(Chloromethyl)-1,3,4-oxadiazol-2-yl]-6-(1H-indol-4-yl)-1-(phenylsulfonyl)-1H-indazole (60 mg, 0.110 mmol) and sodium benzenesulfinate dihydrate (33.1 mg, 0.165 mmol, available from TCI Europe) in ethanol (0.8 ml) were heated under microwave irradiation to 100° C. for 30 mins then 150° C. for 20 mins. The mixture was treated with dichloromethane (3 ml) and methanol (3 ml) and absorbed onto Florisil. This was placed on top a silica cartridge (10 g) and eluted with 0-100% ethyl acetate/cyclohexane and then 0-20% methanol/ethyl acetate. Appropriate fractions were combined and concentrated to give a yellow solid, 33 mg. The solid was treated with isopropanol (1 ml) and 2M aqueous sodium hydroxide (0.999 ml, 1.998 mmol) and stirred at 20° C. for 22 h. The mixture was neutralised with 2M aqueous hydrochloric acid, blown to dryness and purified by Mass Directed Automated Preparative HPLC. Appropriate fraction was evaporated, then azeotroped with methanol to give the title compound as a white solid (8 mg).

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