3-Chloropropanesulphonyl chloride → 2-{[4-(4-[(1-isopropylpiperidin-4-yl)oxy]phenyl)tetrahydro-2H-pyran-4-yl]methyl}isothiazolidine 1,1-dioxide

Participants

Reaction Conditions

Reaction Steps

A solution of (4-{4-[(1-isopropylpiperidin-4-yl)oxy]phenyl}tetrahydro-2H-pyran-4-yl)methylamine (100 mg, 0.30 mmol), 3-chloropropanesulphonyl chloride (51 μl, 0.40 mmol) and N,N-diisopropylethylamine (521 μl, 0.30 mmol) in dichloromethane (2 ml) was stirred at room temperature for 18 hrs. The reaction mixture was concentrated in vacuo and then partitioned between dichloromethane (10 ml) and sodium bicarbonate solution (10 ml). The aqueous layer was extracted with a further 10 ml dichloromethane and the combined organics dried over sodium sulphate and concentrated in vacuo to give an oil. This was dissolved in tetrahydrofuran (2 ml). Potassium tert-butoxide (65 mg, 0.60 mmol) was added to the solution and the reaction mixture stirred at 40° C. for 18 hrs. This was then concentrated in vacuo and partitioned between diethyl ether (10 ml) and water (10 ml). The aqueous layer was extracted with a further 10 ml diethyl ether and the combined organics dried over sodium sulphate and concentrated in vacuo to give a pale yellow oil. The compound was purified by column chromatography on Biotage® silica gel, eluting with dichloromethane:methanol:ammonia, 96:4:0.4 to give the title compound as a pale yellow oil (19 mg, 15%). 1H NMR (400 MHz, CDCl3) δ 7.20 (d, 2H), 6.90 (d, 2H), 4.26 (m, 2H), 3.80 (m, 2H), 3.58 (m, 2H), 3.15 (s, 2H), 2.99 (t, 2H), 2.80 (m, 2H), 2.75 (m, 2H), 2.40 (t, 2H), 2.38 (m, 2H), 2.16 (m, 2H), 2.02 (m, 4H), 1.90 (m, 2H) 1.81 (m, 2H), 1.03 (d, 6H); HRMS (ESI+) 437.2457 (M+H)+.

Provenance & Evidence