Pyridine → Tert-butyl 4-[4-(chloromethyl)-1,3-thiazol-2-yl]piperidine-1-carboxylate

1,1-Dimethylethyl 4-(aminocarbonothioyl)piperidine-1-carboxylate (1.50 g, 6.14 mmol), NaHCO3 (0.570 g, 6.78 mmol) and 1,3-dichloroacetone (0.860 g, 6.77 mmol) were combined in 1,2-dichloroethane (4 mL) and the reaction mixture was stirred at room temperature for 12 h. The crude reaction mixture was filtered using CH2Cl2 and the filtrate was concentrated in vacuo until approximately 30 mL of solvent remained. To this solution was added pyridine (0.75 mL, 9.2 mmol), and the solution was cooled with an ice bath. Thionyl chloride (0.49 mL, 6.8 mmol) was added and the solution was allowed to warm slowly to room temperature. The solvent was removed in vacuo and the residue was taken up in 10% MeOH/ethyl acetate (100 mL). The organic layer was washed with H2O (100 mL) and brine (100 mL), dried (Na2SO4), filtered, and concentrated in vacuo to yield 2.24 g (>100%) of crude 1,1-dimethylethyl 4-[4-(chloromethyl)-1,3-thiazol-2-yl]piperidine-1-carboxylate as a colorless oil. 1H NMR (400 MHz, d6-DMSO): 7.62 (s, 1H), 4.60 (s, 2H), 3.98 (m, 1H), 3.63 (dd, 2H), 3.16 (m, 1H), 2.90 (broad s, 2H), 2.01 (dd, 1H), 1.51 (m, 2H), 1.40 (s, 9H). MS (EI) for C14H21N2O2SCl: 261 (M−tBu).

1. customThe crude reaction mixture
2. filtrationwas filtered
3. concentrationthe filtrate was concentrated in vacuo until approximately 30 mL of solvent
4. temperaturethe solution was cooled with an ice bath
5. temperatureto warm slowly to room temperature
6. customThe solvent was removed in vacuo
7. washThe organic layer was washed with H2O (100 mL) and brine (100 mL)
8. dry with materialdried (Na2SO4)
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD record

ord-82eb545a01f244b586379f4efcedd709

Source dataset

uspto-grants-2014_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08658654B2