Dimethyl Sulfoxide → 878167-05-6

Temperature

-78 °C

To a 100 mL round bottom flask was added DCM (30 mL) and oxalyl chloride (0.88 mL; 10.13 mmol). The solution was cooled to −78° C. and treated with DMSO (1.19 mL; 16.88 mmol). The solution was stirred at −78° C. for 20 minutes and then treated with ethyl 4-(hydroxymethyl)-4-methylpiperidine-1-carboxylate (1.7 g; 8.44 mmol, dissolved in 10 mL of DCM). The solution was stirred for 30 minutes at −78° C. and then treated with Et3N (3.53 mL; 25.32 mmol). The solution was stirred at −78° C. for 20 min and then slowly warmed to room temperature and stirred at room temperature for an additional 2 hours. The solution was then treated with saturated aqueous NaHCO3 (50 mL), diluted with DCM (50 mL), and the layers were separated. The organic layer was washed with brine (50 mL), dried over Na2SO4, filtered, and concentrated under reduced pressure to afford the product as an oil that was used without further purification. LC/MS m/z (M+1) 200.0, retention time 2.23 minutes; (10-99% CH3CN—H2O gradient with 0.03% TFA, 5 min). 1H NMR (400 MHz, CDCl3) δ 9.40 (s, 1H), 4.06 (q, J=7.1 Hz, 2H), 3.66 (dt, J=13.6, 4.7 Hz, 2H), 3.09 (dd, J=10.1, 3.5 Hz, 1H), 3.06 (dd, J=10.2, 3.4 Hz, 1H), 1.86 (dt, J=13.6, 4.4 Hz, 2H), 1.42-1.30 (m, 2H), 1.19 (t, J=7.1 Hz, 3H), 1.02 (s, 3H).

1. stirringThe solution was stirred for 30 minutes at −78° C.
2. stirringThe solution was stirred at −78° C. for 20 min
3. temperatureslowly warmed to room temperature
4. stirringstirred at room temperature for an additional 2 hours
5. customthe layers were separated
6. washThe organic layer was washed with brine (50 mL)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure

ORD record

ord-36d20f3fbfb94f8cb7ea4eb95b3ef811

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08367691B2