Triethylamine → tert-butyl 2-bromo-4H,5H,6H,7H-thieno[2,3-c]pyridine-6-carboxylate

To tert-butyl 4,5-dihydrothieno[2,3-c]pyridine-6(7H)-carboxylate (2.0 g, 8.4 mmol) in chloroform (100 mL) at 0° C. was added dropwise bromine (430 μL, 8.4 mmol). The reaction was stirred 45 min with gradual warming to room temperature. The mixture was cooled to 0° C., and triethylamine (1.2 mL, 8.4 mmol) was added followed by di-tert-butyl dicarbonate (913 mg, 4.2 mmol). The reaction was stirred 1 hour, diluted with dichloromethane (50 mL), washed with 1.0 N HCl (1×50 mL), dried over MgSO4, and concentrated under reduced pressure. The resulting crude residue was purified via silica gel chromatography to afford 2 g (77% yield) of tert-butyl 2-bromo-4,5-dihydrothieno[2,3-c]pyridine-6(7H)-carboxylate as a colorless oil; 1H NMR (CDCl3) δ 6.78 (s, 1H), 4.50 (s, 2H), 3.67 (t, J=5.7 Hz, 2H), 2.65 (t, J=5.7 Hz, 2H), 1.50 (s, 9H); ES-MS: m/e=261.9 (M−55)+.

1. temperatureThe mixture was cooled to 0° C.
2. stirringThe reaction was stirred 1 hour
3. washwashed with 1.0 N HCl (1×50 mL)
4. dry with materialdried over MgSO4
5. concentrationconcentrated under reduced pressure
6. customThe resulting crude residue was purified via silica gel chromatography

ORD record

ord-64b49234c378415486824a61f8e138a9

Source dataset

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07872031B2