Formaldehyde → HCID 57494824, compound

Participants

Reaction Steps

4-[2-(1-Azetidin-3-yl-1H-pyrazol-5-yl)-4-fluorophenoxy]-5-chloro-2-flouro-N-1,3-thiazol-4-ylbenzenesulfonamide (Example 808, 29 mg, 0.052 mmol) was stirred in dichloromethane (2 ml), methanol (0.2 ml), aqueous formaldehyde (0.015 ml of 37% wt/vol) added and the reaction stirred at room temperature for a further 30 minutes. Sodium triacetoxyborohydride (37 mg, 0.172 mmol) was added and the solution stirred for 3 hours. The solvents were removed in vacuo and the residue dissolved in ethyl acetate and extracted with saturated aqueous sodium hydrogencarbonate solution (2×10 ml) and brine (2×10 ml). The organic layer was separated, dried over sodium sulphate, filtered and evaporated to give a solid. The compound was purified using preparative HPLC to afford the title compound. Yield 15.9 mg 57%.

Provenance & Evidence