Sodium Carbonate → 1-{1-[3-(Methyloxy)-4-nitrophenyl]-4-piperidinyl}-4-[2-(methylsulfonyl)ethyl]piperazine

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To a suspension of 1-{1-[3-(methyloxy)-4-nitrophenyl]-4-piperidinyl}piperazine (Example 57, step C) (10.0 g, 23.27 mmol) and 1,4-dioxane (400 mL) was added MeOH (˜100 mL) to enhance solubility. Methyl vinyl sulfone (6.1 mL, 69.8 mmol) and Na2CO3 (7.4 g, 69.8 mmol) were added and the resultant mixture was heated at 80° C. overnight (˜16 h). LCMS indicated that the reaction had gone to completion. The solvent was evaporated and the residue was taken up in DCM (300 mL) and filtered to remove salts. The filtrate was concentrated in vacuo to afford the title compound of step A (9.9 g, >95%) which was carried forward with no further purification. MS (ES+, m/z) 427 (M+1).

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