Methanesulfonyl chloride → 1-{1-[3-(Methyloxy)-4-nitrophenyl]-4-piperidinyl}-4-(methylsulfonyl)piperazine

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Reaction Steps

To a suspension of 1-{1-[3-(methyloxy)-4-nitrophenyl]-4-piperidinyl}piperazine (Example 57, step C) (5.0 g, 11.6 mmol), methane sulfonyl chloride (1.4 mL, 17.5 mmol) and DCM (200 mL) was added TEA (80.1 mL, 58.2 mmol). The reaction was stirred at rt and monitored by TLC. After complete consumption of the starting material the clear yellow solution was concentrated onto silica gel and purified by chromatography to afford the title compound of step A as a yellow solid (3.54 g, 76%). 1H NMR (400 MHz, DMSO-d6) δ 7.85 (d, J=9.5 Hz, 1H), 6.57 (dd, J=9.2, 2.6 Hz, 1H), 6.48 (d, J=2.6 Hz, 1H), 4.09-4.00 (m, 2H), 3.89 (s, 3H), 3.10-3.03 (m, 4H), 2.99-2.90 (m, 2H), 2.84 (s, 3H), 2.61-2.52 (m, 5H), 1.85-1.77 (m, 2H), 1.50-1.37 (m, 2H).

Provenance & Evidence