Chlorosuccinimide → 6-bromo-3-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine

Participants

Reaction Conditions

Reaction Steps

A solution of 6-bromo-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (C, 1000 mg, 3.69 mmol) in chloroform (15 mL) was diluted with 1-chloropyrrolidine-2,5-dione (NCS, 492 mg, 3.69 mmol). The mixture then was heated in a sealed tube at about 33° C. for about 16 hr, followed by heating the reaction mixture for about 24 hr at about 37° C., and then for an additional 5 days at about 43° C. The reaction mixture then was cooled to ambient temperature, diluted with 1N aqueous sodium hydroxide solution and DCM. The organic layer was separated, washed with brine, dried over sodium sulfate, filtered off and concentrated in vacuo. The resulting resulting residue was purified by column chromatography [ISCO, SiO2, 80 g, EtOAc/heptane=5/95 2 min, 5/95 to 30/70 2-15 min, to 35/65 15-18 min, then 35%]. Fractions were combined and concentrated in vacuo yielding 6-bromo-3-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (F, 453 mg), and 6-bromo-5-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (E, ˜500 mg). (F): LCMS (m/z): 305.0[M+H]+; Retention time=1.01 min. (E): LCMS (m/z): 305.0 [M+H]+; Retention time=0.96 min.

Provenance & Evidence